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 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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