31=d-12

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Solution for 31=d-12 equation: 



31=d-12

We move all terms to the left:

31-(d-12)=0

We get rid of parentheses

-d+12+31=0

We add all the numbers together, and all the variables

-1d+43=0

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

-d=-43

d=-43/-1

d=+43

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