15=3d+12

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Solution for 15=3d+12 equation: 



15=3d+12

We move all terms to the left:

15-(3d+12)=0

We get rid of parentheses

-3d-12+15=0

We add all the numbers together, and all the variables

-3d+3=0

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

-3d=-3

d=-3/-3

d=1

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