4d-9=31

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Solution for 4d-9=31 equation: 



4d-9=31

We move all terms to the left:

4d-9-(31)=0

We add all the numbers together, and all the variables

4d-40=0

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

4d=40

d=40/4

d=10

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