3d-d+5d=7

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Solution for 3d-d+5d=7 equation: 



3d-d+5d=7

We move all terms to the left:

3d-d+5d-(7)=0

We add all the numbers together, and all the variables

7d-7=0

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

7d=7

d=7/7

d=1

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