3x+6=42-x

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Solution for 3x+6=42-x equation: 



3x+6=42-x

We move all terms to the left:

3x+6-(42-x)=0

We add all the numbers together, and all the variables

3x-(-1x+42)+6=0

We get rid of parentheses

3x+1x-42+6=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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