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b-15=4b-3
We move all terms to the left:
b-15-(4b-3)=0
We get rid of parentheses
b-4b+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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