31=2d+9

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Solution for 31=2d+9 equation: 



31=2d+9

We move all terms to the left:

31-(2d+9)=0

We get rid of parentheses

-2d-9+31=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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