7d+2d-d=8

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Solution for 7d+2d-d=8 equation: 



7d+2d-d=8

We move all terms to the left:

7d+2d-d-(8)=0

We add all the numbers together, and all the variables

8d-8=0

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

8d=8

d=8/8

d=1

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