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4b+2(b-3)=18
We move all terms to the left:
4b+2(b-3)-(18)=0
We multiply parentheses
4b+2b-6-18=0
We add all the numbers together, and all the variables
6b-24=0
We move all terms containing b to the left, all other terms to the right
6b=24
b=24/6
b=4
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