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20b+2b+3b+4b-25b=12
We move all terms to the left:
20b+2b+3b+4b-25b-(12)=0
We add all the numbers together, and all the variables
4b-12=0
We move all terms containing b to the left, all other terms to the right
4b=12
b=12/4
b=3
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