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7(b+7)=-70
We move all terms to the left:
7(b+7)-(-70)=0
We add all the numbers together, and all the variables
7(b+7)+70=0
We multiply parentheses
7b+49+70=0
We add all the numbers together, and all the variables
7b+119=0
We move all terms containing b to the left, all other terms to the right
7b=-119
b=-119/7
b=-17
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