84+21d=53

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Solution for 84+21d=53 equation: 



84+21d=53

We move all terms to the left:

84+21d-(53)=0

We add all the numbers together, and all the variables

21d+31=0

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

21d=-31

d=-31/21

d=-1+10/21

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