13d-7d=-30

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Solution for 13d-7d=-30 equation: 



13d-7d=-30

We move all terms to the left:

13d-7d-(-30)=0

We add all the numbers together, and all the variables

6d+30=0

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

6d=-30

d=-30/6

d=-5

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