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-264=8(-5b+7)
We move all terms to the left:
-264-(8(-5b+7))=0
We calculate terms in parentheses: -(8(-5b+7)), so:We get rid of parentheses
8(-5b+7)
We multiply parentheses
-40b+56
Back to the equation:
-(-40b+56)
40b-56-264=0
We add all the numbers together, and all the variables
40b-320=0
We move all terms containing b to the left, all other terms to the right
40b=320
b=320/40
b=8
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