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15+6b+6b+6b-4b=-1
We move all terms to the left:
15+6b+6b+6b-4b-(-1)=0
We add all the numbers together, and all the variables
14b+16=0
We move all terms containing b to the left, all other terms to the right
14b=-16
b=-16/14
b=-1+1/7
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