2d+4d+2d-d-2d=20

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Solution for 2d+4d+2d-d-2d=20 equation: 



2d+4d+2d-d-2d=20

We move all terms to the left:

2d+4d+2d-d-2d-(20)=0

We add all the numbers together, and all the variables

5d-20=0

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

5d=20

d=20/5

d=4

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