15=9+3d

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Solution for 15=9+3d equation: 



15=9+3d

We move all terms to the left:

15-(9+3d)=0

We add all the numbers together, and all the variables

-(3d+9)+15=0

We get rid of parentheses

-3d-9+15=0

We add all the numbers together, and all the variables

-3d+6=0

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

-3d=-6

d=-6/-3

d=+2

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