7d+d-5d-2d+2d=15

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Solution for 7d+d-5d-2d+2d=15 equation: 



7d+d-5d-2d+2d=15

We move all terms to the left:

7d+d-5d-2d+2d-(15)=0

We add all the numbers together, and all the variables

3d-15=0

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

3d=15

d=15/3

d=5

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