4/7d=21

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Solution for 4/7d=21 equation: 



4/7d=21

We move all terms to the left:

4/7d-(21)=0



Domain of the equation: 7d!=0

d!=0/7

d!=0

d∈R



We multiply all the terms by the denominator


-21*7d+4=0

Wy multiply elements

-147d+4=0

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

-147d=-4

d=-4/-147

d=4/147

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