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15b+9=-3(-5b-3)
We move all terms to the left:
15b+9-(-3(-5b-3))=0
We calculate terms in parentheses: -(-3(-5b-3)), so:We get rid of parentheses
-3(-5b-3)
We multiply parentheses
15b+9
Back to the equation:
-(15b+9)
15b-15b-9+9=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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