31=9d+4

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Solution for 31=9d+4 equation: 



31=9d+4

We move all terms to the left:

31-(9d+4)=0

We get rid of parentheses

-9d-4+31=0

We add all the numbers together, and all the variables

-9d+27=0

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

-9d=-27

d=-27/-9

d=+3

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