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1b+4b-15b-2b=15
We move all terms to the left:
1b+4b-15b-2b-(15)=0
We add all the numbers together, and all the variables
-12b-15=0
We move all terms containing b to the left, all other terms to the right
-12b=15
b=15/-12
b=-1+1/4
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