-15=2d+9

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Solution for -15=2d+9 equation: 



-15=2d+9

We move all terms to the left:

-15-(2d+9)=0

We get rid of parentheses

-2d-9-15=0

We add all the numbers together, and all the variables

-2d-24=0

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

-2d=24

d=24/-2

d=-12

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