d+2d+3d-d-4d=7

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Solution for d+2d+3d-d-4d=7 equation: 



d+2d+3d-d-4d=7

We move all terms to the left:

d+2d+3d-d-4d-(7)=0

We add all the numbers together, and all the variables

d-7=0

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

d=7

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