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-(7x+31)+15=
We move all terms to the left:
-(7x+31)+15-()=0
We add all the numbers together, and all the variables
-(7x+31)=0
We get rid of parentheses
-7x-31=0
We move all terms containing x to the left, all other terms to the right
-7x=31
x=31/-7
x=-4+3/7
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