21=d+4

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Solution for 21=d+4 equation: 



21=d+4

We move all terms to the left:

21-(d+4)=0

We get rid of parentheses

-d-4+21=0

We add all the numbers together, and all the variables

-1d+17=0

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

-d=-17

d=-17/-1

d=+17

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