21=12d-7

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Solution for 21=12d-7 equation: 



21=12d-7

We move all terms to the left:

21-(12d-7)=0

We get rid of parentheses

-12d+7+21=0

We add all the numbers together, and all the variables

-12d+28=0

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

-12d=-28

d=-28/-12

d=2+1/3

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