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-(7+x)=13
We move all terms to the left:
-(7+x)-(13)=0
We add all the numbers together, and all the variables
-(x+7)-13=0
We get rid of parentheses
-x-7-13=0
We add all the numbers together, and all the variables
-1x-20=0
We move all terms containing x to the left, all other terms to the right
-x=20
x=20/-1
x=-20
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