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-(3+6x)=x-31
We move all terms to the left:
-(3+6x)-(x-31)=0
We add all the numbers together, and all the variables
-(6x+3)-(x-31)=0
We get rid of parentheses
-6x-x-3+31=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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