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(3x+15)+(2x-14)=31
We move all terms to the left:
(3x+15)+(2x-14)-(31)=0
We get rid of parentheses
3x+2x+15-14-31=0
We add all the numbers together, and all the variables
5x-30=0
We move all terms containing x to the left, all other terms to the right
5x=30
x=30/5
x=6
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