21-4d=42+3d

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Solution for 21-4d=42+3d equation: 



21-4d=42+3d

We move all terms to the left:

21-4d-(42+3d)=0

We add all the numbers together, and all the variables

-4d-(3d+42)+21=0

We get rid of parentheses

-4d-3d-42+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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