7d-12d=20

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Solution for 7d-12d=20 equation: 



7d-12d=20

We move all terms to the left:

7d-12d-(20)=0

We add all the numbers together, and all the variables

-5d-20=0

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

-5d=20

d=20/-5

d=-4

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