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b/13+15=18
We move all terms to the left:
b/13+15-(18)=0
We add all the numbers together, and all the variables
b/13-3=0
We multiply all the terms by the denominator
b-3*13=0
We add all the numbers together, and all the variables
b-39=0
We move all terms containing b to the left, all other terms to the right
b=39
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