d+d+d=15

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Solution for d+d+d=15 equation: 



d+d+d=15

We move all terms to the left:

d+d+d-(15)=0

We add all the numbers together, and all the variables

3d-15=0

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

3d=15

d=15/3

d=5

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