21=d/30

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Solution for 21=d/30 equation: 



21=d/30

We move all terms to the left:

21-(d/30)=0

We add all the numbers together, and all the variables

-(+d/30)+21=0

We get rid of parentheses

-d/30+21=0

We multiply all the terms by the denominator


-d+21*30=0

We add all the numbers together, and all the variables

-1d+630=0

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

-d=-630

d=-630/-1

d=+630

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