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180=-9(b-8)
We move all terms to the left:
180-(-9(b-8))=0
We calculate terms in parentheses: -(-9(b-8)), so:We get rid of parentheses
-9(b-8)
We multiply parentheses
-9b+72
Back to the equation:
-(-9b+72)
9b-72+180=0
We add all the numbers together, and all the variables
9b+108=0
We move all terms containing b to the left, all other terms to the right
9b=-108
b=-108/9
b=-12
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