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