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-147=-3(7b-7)
We move all terms to the left:
-147-(-3(7b-7))=0
We calculate terms in parentheses: -(-3(7b-7)), so:We get rid of parentheses
-3(7b-7)
We multiply parentheses
-21b+21
Back to the equation:
-(-21b+21)
21b-21-147=0
We add all the numbers together, and all the variables
21b-168=0
We move all terms containing b to the left, all other terms to the right
21b=168
b=168/21
b=8
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