21=2d+7

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Solution for 21=2d+7 equation: 



21=2d+7

We move all terms to the left:

21-(2d+7)=0

We get rid of parentheses

-2d-7+21=0

We add all the numbers together, and all the variables

-2d+14=0

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

-2d=-14

d=-14/-2

d=+7

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