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-7(x+10)=-91
We move all terms to the left:
-7(x+10)-(-91)=0
We add all the numbers together, and all the variables
-7(x+10)+91=0
We multiply parentheses
-7x-70+91=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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