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10(-7x-7)+7x=-7
We move all terms to the left:
10(-7x-7)+7x-(-7)=0
We add all the numbers together, and all the variables
7x+10(-7x-7)+7=0
We multiply parentheses
7x-70x-70+7=0
We add all the numbers together, and all the variables
-63x-63=0
We move all terms containing x to the left, all other terms to the right
-63x=63
x=63/-63
x=-1
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