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-84=2(-7+7b)
We move all terms to the left:
-84-(2(-7+7b))=0
We add all the numbers together, and all the variables
-(2(7b-7))-84=0
We calculate terms in parentheses: -(2(7b-7)), so:We get rid of parentheses
2(7b-7)
We multiply parentheses
14b-14
Back to the equation:
-(14b-14)
-14b+14-84=0
We add all the numbers together, and all the variables
-14b-70=0
We move all terms containing b to the left, all other terms to the right
-14b=70
b=70/-14
b=-5
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