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3b-25=-2(3b-1)
We move all terms to the left:
3b-25-(-2(3b-1))=0
We calculate terms in parentheses: -(-2(3b-1)), so:We get rid of parentheses
-2(3b-1)
We multiply parentheses
-6b+2
Back to the equation:
-(-6b+2)
3b+6b-2-25=0
We add all the numbers together, and all the variables
9b-27=0
We move all terms containing b to the left, all other terms to the right
9b=27
b=27/9
b=3
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