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-(x-7)=-7
We move all terms to the left:
-(x-7)-(-7)=0
We add all the numbers together, and all the variables
-(x-7)+7=0
We get rid of parentheses
-x+7+7=0
We add all the numbers together, and all the variables
-1x+14=0
We move all terms containing x to the left, all other terms to the right
-x=-14
x=-14/-1
x=+14
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