7d+8d=-28

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Solution for 7d+8d=-28 equation: 



7d+8d=-28

We move all terms to the left:

7d+8d-(-28)=0

We add all the numbers together, and all the variables

15d+28=0

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

15d=-28

d=-28/15

d=-1+13/15

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