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3(-3-3b)-5(3-3b)=0
We add all the numbers together, and all the variables
3(-3b-3)-5(-3b+3)=0
We multiply parentheses
-9b+15b-9-15=0
We add all the numbers together, and all the variables
6b-24=0
We move all terms containing b to the left, all other terms to the right
6b=24
b=24/6
b=4
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