21d-9=75

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Solution for 21d-9=75 equation: 



21d-9=75

We move all terms to the left:

21d-9-(75)=0

We add all the numbers together, and all the variables

21d-84=0

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

21d=84

d=84/21

d=4

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