72+21d=429

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Solution for 72+21d=429 equation: 



72+21d=429

We move all terms to the left:

72+21d-(429)=0

We add all the numbers together, and all the variables

21d-357=0

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

21d=357

d=357/21

d=17

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