15d+d-4=-20

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Solution for 15d+d-4=-20 equation: 



15d+d-4=-20

We move all terms to the left:

15d+d-4-(-20)=0

We add all the numbers together, and all the variables

16d+16=0

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

16d=-16

d=-16/16

d=-1

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