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b/3-7=-3
We move all terms to the left:
b/3-7-(-3)=0
We add all the numbers together, and all the variables
b/3-4=0
We multiply all the terms by the denominator
b-4*3=0
We add all the numbers together, and all the variables
b-12=0
We move all terms containing b to the left, all other terms to the right
b=12
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