-13d-7d=-20

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Solution for -13d-7d=-20 equation: 



-13d-7d=-20

We move all terms to the left:

-13d-7d-(-20)=0

We add all the numbers together, and all the variables

-20d+20=0

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

-20d=-20

d=-20/-20

d=1

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