18d+3d+5d-21d=15

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Solution for 18d+3d+5d-21d=15 equation: 



18d+3d+5d-21d=15

We move all terms to the left:

18d+3d+5d-21d-(15)=0

We add all the numbers together, and all the variables

5d-15=0

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

5d=15

d=15/5

d=3

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