4d-21=55

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Solution for 4d-21=55 equation: 



4d-21=55

We move all terms to the left:

4d-21-(55)=0

We add all the numbers together, and all the variables

4d-76=0

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

4d=76

d=76/4

d=19

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