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7+b/3=3
We move all terms to the left:
7+b/3-(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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