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