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3=-12/b
We move all terms to the left:
3-(-12/b)=0
Domain of the equation: b)!=0We get rid of parentheses
b!=0/1
b!=0
b∈R
12/b+3=0
We multiply all the terms by the denominator
3*b+12=0
We add all the numbers together, and all the variables
3b+12=0
We move all terms containing b to the left, all other terms to the right
3b=-12
b=-12/3
b=-4
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