21d+13=622

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Solution for 21d+13=622 equation: 



21d+13=622

We move all terms to the left:

21d+13-(622)=0

We add all the numbers together, and all the variables

21d-609=0

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

21d=609

d=609/21

d=29

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