15+3x-x=31+x-x

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Solution for 15+3x-x=31+x-x equation: 



15+3x-x=31+x-x

We move all terms to the left:

15+3x-x-(31+x-x)=0

We add all the numbers together, and all the variables

3x-x+15-31=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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