4=-12/d

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Solution for 4=-12/d equation: 



4=-12/d

We move all terms to the left:

4-(-12/d)=0



Domain of the equation: d)!=0

d!=0/1

d!=0

d∈R



We get rid of parentheses

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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