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20b+b-15b-4b-4b=12
We move all terms to the left:
20b+b-15b-4b-4b-(12)=0
We add all the numbers together, and all the variables
-2b-12=0
We move all terms containing b to the left, all other terms to the right
-2b=12
b=12/-2
b=-6
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