15=18-3d

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Solution for 15=18-3d equation: 



15=18-3d

We move all terms to the left:

15-(18-3d)=0

We add all the numbers together, and all the variables

-(-3d+18)+15=0

We get rid of parentheses

3d-18+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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