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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