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42=4(-3+4b)-(6b+6)
We move all terms to the left:
42-(4(-3+4b)-(6b+6))=0
We add all the numbers together, and all the variables
-(4(4b-3)-(6b+6))+42=0
We calculate terms in parentheses: -(4(4b-3)-(6b+6)), so:We get rid of parentheses
4(4b-3)-(6b+6)
We multiply parentheses
16b-(6b+6)-12
We get rid of parentheses
16b-6b-6-12
We add all the numbers together, and all the variables
10b-18
Back to the equation:
-(10b-18)
-10b+18+42=0
We add all the numbers together, and all the variables
-10b+60=0
We move all terms containing b to the left, all other terms to the right
-10b=-60
b=-60/-10
b=+6
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