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b/15-12=-13
We move all terms to the left:
b/15-12-(-13)=0
We add all the numbers together, and all the variables
b/15+1=0
We multiply all the terms by the denominator
b+1*15=0
We add all the numbers together, and all the variables
b+15=0
We move all terms containing b to the left, all other terms to the right
b=-15
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