-d+15=9

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Solution for -d+15=9 equation: 



-d+15=9

We move all terms to the left:

-d+15-(9)=0

We add all the numbers together, and all the variables

-1d+6=0

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

-d=-6

d=-6/-1

d=+6

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