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3-2b=4b+15
We move all terms to the left:
3-2b-(4b+15)=0
We get rid of parentheses
-2b-4b-15+3=0
We add all the numbers together, and all the variables
-6b-12=0
We move all terms containing b to the left, all other terms to the right
-6b=12
b=12/-6
b=-2
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