8d+11-d=-31

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Solution for 8d+11-d=-31 equation: 



8d+11-d=-31

We move all terms to the left:

8d+11-d-(-31)=0

We add all the numbers together, and all the variables

7d+42=0

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

7d=-42

d=-42/7

d=-6

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