21d+3d-15d+10d=38

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Solution for 21d+3d-15d+10d=38 equation: 



21d+3d-15d+10d=38

We move all terms to the left:

21d+3d-15d+10d-(38)=0

We add all the numbers together, and all the variables

19d-38=0

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

19d=38

d=38/19

d=2

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