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12(-7x-7)=-756
We move all terms to the left:
12(-7x-7)-(-756)=0
We add all the numbers together, and all the variables
12(-7x-7)+756=0
We multiply parentheses
-84x-84+756=0
We add all the numbers together, and all the variables
-84x+672=0
We move all terms containing x to the left, all other terms to the right
-84x=-672
x=-672/-84
x=+8
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