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4b=18-3b+12
We move all terms to the left:
4b-(18-3b+12)=0
We add all the numbers together, and all the variables
4b-(-3b+30)=0
We get rid of parentheses
4b+3b-30=0
We add all the numbers together, and all the variables
7b-30=0
We move all terms containing b to the left, all other terms to the right
7b=30
b=30/7
b=4+2/7
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