21=d+15

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Solution for 21=d+15 equation: 



21=d+15

We move all terms to the left:

21-(d+15)=0

We get rid of parentheses

-d-15+21=0

We add all the numbers together, and all the variables

-1d+6=0

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

-d=-6

d=-6/-1

d=+6

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