31=3d+7

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Solution for 31=3d+7 equation: 



31=3d+7

We move all terms to the left:

31-(3d+7)=0

We get rid of parentheses

-3d-7+31=0

We add all the numbers together, and all the variables

-3d+24=0

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

-3d=-24

d=-24/-3

d=+8

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