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-7(3+x)=91
We move all terms to the left:
-7(3+x)-(91)=0
We add all the numbers together, and all the variables
-7(x+3)-91=0
We multiply parentheses
-7x-21-91=0
We add all the numbers together, and all the variables
-7x-112=0
We move all terms containing x to the left, all other terms to the right
-7x=112
x=112/-7
x=-16
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