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7b-12=4b+24
We move all terms to the left:
7b-12-(4b+24)=0
We get rid of parentheses
7b-4b-24-12=0
We add all the numbers together, and all the variables
3b-36=0
We move all terms containing b to the left, all other terms to the right
3b=36
b=36/3
b=12
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