12/d=-3

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Solution for 12/d=-3 equation: 



12/d=-3

We move all terms to the left:

12/d-(-3)=0



Domain of the equation: d!=0

d∈R



We add all the numbers together, and all the variables

12/d+3=0

We multiply all the terms by the denominator


3*d+12=0

We add all the numbers together, and all the variables

3d+12=0

We move all terms containing d to the left, all other terms to the right

3d=-12

d=-12/3

d=-4

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