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-(2x+7)=11
We move all terms to the left:
-(2x+7)-(11)=0
We get rid of parentheses
-2x-7-11=0
We add all the numbers together, and all the variables
-2x-18=0
We move all terms containing x to the left, all other terms to the right
-2x=18
x=18/-2
x=-9
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