3d-2d-d+6d+1=31

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Solution for 3d-2d-d+6d+1=31 equation: 



3d-2d-d+6d+1=31

We move all terms to the left:

3d-2d-d+6d+1-(31)=0

We add all the numbers together, and all the variables

6d-30=0

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

6d=30

d=30/6

d=5

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