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3=-b/4
We move all terms to the left:
3-(-b/4)=0
We get rid of parentheses
b/4+3=0
We multiply all the terms by the denominator
b+3*4=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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