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-66=3b-3(5b-2)
We move all terms to the left:
-66-(3b-3(5b-2))=0
We calculate terms in parentheses: -(3b-3(5b-2)), so:We get rid of parentheses
3b-3(5b-2)
We multiply parentheses
3b-15b+6
We add all the numbers together, and all the variables
-12b+6
Back to the equation:
-(-12b+6)
12b-6-66=0
We add all the numbers together, and all the variables
12b-72=0
We move all terms containing b to the left, all other terms to the right
12b=72
b=72/12
b=6
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