-2d+20=42

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Solution for -2d+20=42 equation: 



-2d+20=42

We move all terms to the left:

-2d+20-(42)=0

We add all the numbers together, and all the variables

-2d-22=0

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

-2d=22

d=22/-2

d=-11

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