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15+b/2=-3
We move all terms to the left:
15+b/2-(-3)=0
We add all the numbers together, and all the variables
b/2+18=0
We multiply all the terms by the denominator
b+18*2=0
We add all the numbers together, and all the variables
b+36=0
We move all terms containing b to the left, all other terms to the right
b=-36
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