Solve Linear Equation: 11(-3x+4)-7(6x-2)=3 Step-by-Step

Linear Equations with Distributive Property

11(3x+4)7(6x2)=3 11(-3x+4)-7(6x-2)=3

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Open brackets properly, multiply by each factor
00:23 Solve each multiplication separately
00:50 Collect terms
01:01 Arrange the equation so that X is isolated on one side
01:20 Isolate X
01:33 Break down 55 into factors 5 and 11
01:36 Break down 75 into factors 5 and 15
01:39 Simplify what's possible
01:44 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

11(3x+4)7(6x2)=3 11(-3x+4)-7(6x-2)=3

2

Step-by-step solution

To solve the linear equation 11(3x+4)7(6x2)=3 11(-3x+4)-7(6x-2)=3 , follow these steps:

Begin by applying the distributive property to the expression on both sides:

  • Distribute 11 11 : 11(3x+4)=11(3x)+114=33x+44 11(-3x+4) = 11 \cdot (-3x) + 11 \cdot 4 = -33x + 44 .
  • Distribute 7 -7 : 7(6x2)=76x+7(2)=42x+14 -7(6x-2) = -7 \cdot 6x + -7 \cdot (-2) = -42x + 14 .

Substitute these results back into the equation:

33x+4442x+14=3 -33x + 44 - 42x + 14 = 3

Combine like terms:

(33x42x)+(44+14)=3 (-33x - 42x) + (44 + 14) = 3

75x+58=3 -75x + 58 = 3

Isolate the term with x x by subtracting 58 from both sides:

75x=358 -75x = 3 - 58

75x=55 -75x = -55

Now, solve for x x by dividing both sides by 75-75:

x=5575 x = \frac{-55}{-75}

Simplify the fraction by dividing both numerator and denominator by 5:

x=1115 x = \frac{11}{15}

Therefore, the solution to the equation is 1115\boxed{\frac{11}{15}}.

3

Final Answer

1115 \frac{11}{15}

Key Points to Remember

Essential concepts to master this topic
  • Distributive Property: Apply to each term inside parentheses separately
  • Technique: 11(3x+4)=33x+44 11(-3x+4) = -33x + 44 and 7(6x2)=42x+14 -7(6x-2) = -42x + 14
  • Check: Substitute x=1115 x = \frac{11}{15} back into original equation ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute the negative sign correctly
    Don't apply -7(6x-2) as -42x - 14 = wrong signs everywhere! The negative outside affects both terms inside, so -7 × (-2) = +14. Always distribute the negative sign to each term carefully.

Practice Quiz

Test your knowledge with interactive questions

\( 5x=1 \)

What is the value of x?

FAQ

Everything you need to know about this question

Why do I need to distribute first instead of solving directly?

+

The parentheses must be eliminated first using the distributive property. You can't combine terms that are inside different parentheses until you distribute!

How do I keep track of all the negative signs?

+

Write each step clearly! When you see 7(6x2) -7(6x-2) , think: negative 7 times 6x equals negative 42x, and negative 7 times negative 2 equals positive 14.

What's the difference between -33x and -42x when combining?

+

Both terms have the same variable x, so you add their coefficients: 33x+(42x)=75x -33x + (-42x) = -75x . Think of it as combining like terms.

Why is my final answer a fraction?

+

Fractions are common solutions! 1115 \frac{11}{15} cannot be simplified further since 11 and 15 share no common factors besides 1.

How can I check if my distributive property work is correct?

+

Expand each part separately: 11×(3x)=33x 11 \times (-3x) = -33x and 11×4=44 11 \times 4 = 44 . Then verify the signs match your original expression.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Linear Equations (One Variable) questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations