-15+5d=-20

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Solution for -15+5d=-20 equation: 



-15+5d=-20

We move all terms to the left:

-15+5d-(-20)=0

We add all the numbers together, and all the variables

5d+5=0

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

5d=-5

d=-5/5

d=-1

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