-21/d=-7

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Solution for -21/d=-7 equation: 



-21/d=-7

We move all terms to the left:

-21/d-(-7)=0



Domain of the equation: d!=0

d∈R



We add all the numbers together, and all the variables

-21/d+7=0

We multiply all the terms by the denominator


7*d-21=0

We add all the numbers together, and all the variables

7d-21=0

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

7d=21

d=21/7

d=3

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