7d+10=31

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Solution for 7d+10=31 equation: 



7d+10=31

We move all terms to the left:

7d+10-(31)=0

We add all the numbers together, and all the variables

7d-21=0

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

7d=21

d=21/7

d=3

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