3x+15=-x+7

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Solution for 3x+15=-x+7 equation: 



3x+15=-x+7

We move all terms to the left:

3x+15-(-x+7)=0

We add all the numbers together, and all the variables

3x-(-1x+7)+15=0

We get rid of parentheses

3x+1x-7+15=0

We add all the numbers together, and all the variables

4x+8=0

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

4x=-8

x=-8/4

x=-2

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