3x+12=42-7x

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Solution for 3x+12=42-7x equation: 



3x+12=42-7x

We move all terms to the left:

3x+12-(42-7x)=0

We add all the numbers together, and all the variables

3x-(-7x+42)+12=0

We get rid of parentheses

3x+7x-42+12=0

We add all the numbers together, and all the variables

10x-30=0

We move all terms containing x to the left, all other terms to the right

10x=30

x=30/10

x=3

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