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12b-11b+10b-4b+2b=45
We move all terms to the left:
12b-11b+10b-4b+2b-(45)=0
We add all the numbers together, and all the variables
9b-45=0
We move all terms containing b to the left, all other terms to the right
9b=45
b=45/9
b=5
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