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-(x-7)-x=13
We move all terms to the left:
-(x-7)-x-(13)=0
We add all the numbers together, and all the variables
-1x-(x-7)-13=0
We get rid of parentheses
-1x-x+7-13=0
We add all the numbers together, and all the variables
-2x-6=0
We move all terms containing x to the left, all other terms to the right
-2x=6
x=6/-2
x=-3
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