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-50=4(b+5)-2(6b+7)
We move all terms to the left:
-50-(4(b+5)-2(6b+7))=0
We calculate terms in parentheses: -(4(b+5)-2(6b+7)), so:We get rid of parentheses
4(b+5)-2(6b+7)
We multiply parentheses
4b-12b+20-14
We add all the numbers together, and all the variables
-8b+6
Back to the equation:
-(-8b+6)
8b-6-50=0
We add all the numbers together, and all the variables
8b-56=0
We move all terms containing b to the left, all other terms to the right
8b=56
b=56/8
b=7
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