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3b=4b-15
We move all terms to the left:
3b-(4b-15)=0
We get rid of parentheses
3b-4b+15=0
We add all the numbers together, and all the variables
-1b+15=0
We move all terms containing b to the left, all other terms to the right
-b=-15
b=-15/-1
b=+15
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