13+4d=21

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Solution for 13+4d=21 equation: 



13+4d=21

We move all terms to the left:

13+4d-(21)=0

We add all the numbers together, and all the variables

4d-8=0

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

4d=8

d=8/4

d=2

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