x+15=-x+31

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Solution for x+15=-x+31 equation: 



x+15=-x+31

We move all terms to the left:

x+15-(-x+31)=0

We add all the numbers together, and all the variables

x-(-1x+31)+15=0

We get rid of parentheses

x+1x-31+15=0

We add all the numbers together, and all the variables

2x-16=0

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

2x=16

x=16/2

x=8

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