31=4-9d

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Solution for 31=4-9d equation: 



31=4-9d

We move all terms to the left:

31-(4-9d)=0

We add all the numbers together, and all the variables

-(-9d+4)+31=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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