D-25=2r+15

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Solution for D-25=2r+15 equation: 



-25=2D+15

We move all terms to the left:

-25-(2D+15)=0

We get rid of parentheses

-2D-15-25=0

We add all the numbers together, and all the variables

-2D-40=0

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

-2D=40

D=40/-2

D=-20

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