-7/d=21

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Solution for -7/d=21 equation: 



-7/d=21

We move all terms to the left:

-7/d-(21)=0



Domain of the equation: d!=0

d∈R



We multiply all the terms by the denominator


-21*d-7=0

We add all the numbers together, and all the variables

-21d-7=0

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

-21d=7

d=7/-21

d=-1/3

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