12d-d-6d+10d=30

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Solution for 12d-d-6d+10d=30 equation: 



12d-d-6d+10d=30

We move all terms to the left:

12d-d-6d+10d-(30)=0

We add all the numbers together, and all the variables

15d-30=0

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

15d=30

d=30/15

d=2

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