Solve Linear Equation: -4(6-x)+(3x+5)=14 Step-by-Step

Linear Equations with Mixed Terms

4(6x)+(3x+5)=14 -4(6-x)+(3x+5)=14

❤️ 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
00:03 Open parentheses properly, multiply by each factor
00:06 Negative times positive is always negative
00:17 Collect like terms
00:25 Arrange the equation so that one side has only the unknown X
00:36 Use long addition to calculate
00:44 Isolate X
00:50 Break down into whole fraction and remainder
00:55 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

4(6x)+(3x+5)=14 -4(6-x)+(3x+5)=14

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Apply the distributive property to expand the expression.
  • Step 2: Simplify both sides to isolate the variable.
  • Step 3: Divide to solve for the variable.

Now, let's work through each step:

Step 1: Apply the distributive property
The given equation is 4(6x)+(3x+5)=14 -4(6-x)+(3x+5)=14 .
First, distribute 4-4:
4×6+4×x=24+4x-4 \times 6 + -4 \times -x = -24 + 4x.
Insert this into the equation:
24+4x+3x+5=14-24 + 4x + 3x + 5 = 14.

Step 2: Simplify the equation
Combine like terms (the xx terms and constants):
4x+3x=7x4x + 3x = 7x.
24+5=19-24 + 5 = -19.
So, the equation becomes:
7x19=147x - 19 = 14.

Step 3: Solve for xx
Add 19 to both sides to isolate the xx-term:
7x19+19=14+197x - 19 + 19 = 14 + 19.
7x=337x = 33.
Divide both sides by 7:
x=337x = \frac{33}{7}.
Simplifying this gives x=457x = 4\frac{5}{7}.

Therefore, the solution to the problem is x=457 x = 4\frac{5}{7} .

3

Final Answer

457 4\frac{5}{7}

Key Points to Remember

Essential concepts to master this topic
  • Distributive Property: Expand -4(6-x) as -24 + 4x before combining
  • Technique: Combine like terms: 4x + 3x = 7x and -24 + 5 = -19
  • Check: Substitute x = 33/7 back: -4(6-33/7) + (3·33/7 + 5) = 14 ✓

Common Mistakes

Avoid these frequent errors
  • Incorrectly distributing the negative sign
    Don't distribute -4(6-x) as -24 - 4x = wrong answer! The negative times negative gives positive, so -4 × (-x) = +4x. Always remember that negative times negative equals positive.

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 does -4 times -x equal +4x?

+

Remember the rule: negative × negative = positive! When you distribute -4 into (6-x), you get -4×6 = -24 and -4×(-x) = +4x.

How do I convert 33/7 to a mixed number?

+

Divide 33 by 7: 33 ÷ 7 = 4 remainder 5. So 337=457 \frac{33}{7} = 4\frac{5}{7} . The quotient becomes the whole number, remainder becomes the new numerator.

What if I combine the constants first instead of the x terms?

+

Either order works fine! You can combine -24 + 5 = -19 first, then 4x + 3x = 7x, or vice versa. The important thing is to combine all like terms.

Do I always need to write fractions as mixed numbers?

+

Not necessarily! Both 337 \frac{33}{7} and 457 4\frac{5}{7} are correct. Mixed numbers are often preferred for final answers because they're easier to visualize.

How can I check my work without substituting back?

+

You can work backwards! Start with your answer x = 33/7, then work through each step in reverse. But substitution into the original equation is the most reliable check.

🌟 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