31+7d=-12

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Solution for 31+7d=-12 equation: 



31+7d=-12

We move all terms to the left:

31+7d-(-12)=0

We add all the numbers together, and all the variables

7d+43=0

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

7d=-43

d=-43/7

d=-6+1/7

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