-42=3d-21

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Solution for -42=3d-21 equation: 



-42=3d-21

We move all terms to the left:

-42-(3d-21)=0

We get rid of parentheses

-3d+21-42=0

We add all the numbers together, and all the variables

-3d-21=0

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

-3d=21

d=21/-3

d=-7

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