2x+15=-x+42

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Solution for 2x+15=-x+42 equation: 



2x+15=-x+42

We move all terms to the left:

2x+15-(-x+42)=0

We add all the numbers together, and all the variables

2x-(-1x+42)+15=0

We get rid of parentheses

2x+1x-42+15=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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