Solve Linear Equation: 6x·2-4+2x+2=5 Step by Step

Linear Equations with Multiplication and Combining Terms

6x24+2x+2=5 6x\cdot2-4+2x+2=5

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We'll solve according to proper order of operations, from left to right
00:12 Let's group like terms
00:19 We want to isolate the unknown X
00:25 Let's arrange the equation so that one side has only the unknown X
00:43 Let's isolate the unknown X, and calculate
00:54 Let's factor 14 into 7 and 2
00:57 Let's reduce what we can
01:01 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

6x24+2x+2=5 6x\cdot2-4+2x+2=5

2

Step-by-step solution

To solve the linear equation 6x24+2x+2=5 6x \cdot 2 - 4 + 2x + 2 = 5 , follow these steps:

  • Step 1: Simplify the expression on the left-hand side of the equation.
  • Step 2: Combine like terms to reduce the equation.
  • Step 3: Isolate the variable x x to determine its value.

Let's simplify and solve the given equation:

Step 1: Simplify the expression 6x24+2x+2 6x \cdot 2 - 4 + 2x + 2 .
This becomes 12x4+2x+2 12x - 4 + 2x + 2 .

Step 2: Combine like terms.
Combine the terms involving x x : 12x+2x=14x 12x + 2x = 14x .
Combine the constants: 4+2=2-4 + 2 = -2.
This results in the equation 14x2=5 14x - 2 = 5 .

Step 3: Isolate x x .
Add 2 to both sides to eliminate the constant on the left:
14x2+2=5+2 14x - 2 + 2 = 5 + 2 .
This simplifies to 14x=7 14x = 7 .
Next, divide both sides by 14 to solve for x x :
x=714 x = \frac{7}{14} .

Simplify the fraction:x=12 x = \frac{1}{2} .

Therefore, the solution to the equation is x=12 x = \frac{1}{2} .

3

Final Answer

x=12 x=\frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Simplify multiplication first, then combine like terms
  • Technique: Combine 12x + 2x = 14x and -4 + 2 = -2
  • Check: Substitute x=12 x = \frac{1}{2} : 14(1/2) - 2 = 5 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify 6x·2 before combining terms
    Don't leave 6x·2 as is when combining with 2x = wrong coefficient count! This leads to incorrect like terms and wrong final answers. Always multiply 6x·2 = 12x first, then combine 12x + 2x = 14x.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{-y}{5}=-25 \)

FAQ

Everything you need to know about this question

Why do I multiply 6x·2 first instead of combining with 2x?

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You must follow the order of operations! Multiplication comes before addition, so calculate 6x2=12x 6x \cdot 2 = 12x first. Only then can you combine like terms: 12x + 2x.

How do I know which terms are 'like terms'?

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Like terms have the exact same variable part. Here, 12x and 2x are like terms (both have x). Constants -4 and +2 are also like terms (no variables).

What if I get a different fraction when I check my answer?

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Double-check your arithmetic! Make sure you correctly simplified 6x2=12x 6x \cdot 2 = 12x and combined terms properly. Small calculation errors lead to wrong final answers.

Can I solve this equation differently?

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Yes! You could distribute and rearrange terms in different orders, but you'll get the same answer. The key is always following order of operations and combining like terms correctly.

Why is the answer 1/2 and not a whole number?

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Not all equations have whole number solutions! x=12 x = \frac{1}{2} is perfectly valid. When you substitute it back, you get 7 = 7, confirming it's correct.

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