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15=3b+3
We move all terms to the left:
15-(3b+3)=0
We get rid of parentheses
-3b-3+15=0
We add all the numbers together, and all the variables
-3b+12=0
We move all terms containing b to the left, all other terms to the right
-3b=-12
b=-12/-3
b=+4
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