20d-9d-9d-8d=-12

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Solution for 20d-9d-9d-8d=-12 equation: 



20d-9d-9d-8d=-12

We move all terms to the left:

20d-9d-9d-8d-(-12)=0

We add all the numbers together, and all the variables

-6d+12=0

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

-6d=-12

d=-12/-6

d=+2

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