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20b+2b+2b+2b-23b=12
We move all terms to the left:
20b+2b+2b+2b-23b-(12)=0
We add all the numbers together, and all the variables
3b-12=0
We move all terms containing b to the left, all other terms to the right
3b=12
b=12/3
b=4
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