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12b-6b+2b-2b-3b=18
We move all terms to the left:
12b-6b+2b-2b-3b-(18)=0
We add all the numbers together, and all the variables
3b-18=0
We move all terms containing b to the left, all other terms to the right
3b=18
b=18/3
b=6
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