-15=9d+1-7d

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Solution for -15=9d+1-7d equation: 



-15=9d+1-7d

We move all terms to the left:

-15-(9d+1-7d)=0

We add all the numbers together, and all the variables

-(2d+1)-15=0

We get rid of parentheses

-2d-1-15=0

We add all the numbers together, and all the variables

-2d-16=0

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

-2d=16

d=16/-2

d=-8

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