21.0=4.2d

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Solution for 21.0=4.2d equation: 



21.0=4.2d

We move all terms to the left:

21.0-(4.2d)=0

We add all the numbers together, and all the variables

-(+4.2d)+21.0=0

We add all the numbers together, and all the variables

-(+4.2d)+21=0

We get rid of parentheses

-4.2d+21=0

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

-4.2d=-21

d=-21/-4.2

d=+5

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