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-3b+3=4b-12
We move all terms to the left:
-3b+3-(4b-12)=0
We get rid of parentheses
-3b-4b+12+3=0
We add all the numbers together, and all the variables
-7b+15=0
We move all terms containing b to the left, all other terms to the right
-7b=-15
b=-15/-7
b=2+1/7
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