7=d-21

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Solution for 7=d-21 equation: 



7=d-21

We move all terms to the left:

7-(d-21)=0

We get rid of parentheses

-d+21+7=0

We add all the numbers together, and all the variables

-1d+28=0

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

-d=-28

d=-28/-1

d=+28

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