21+4d=5

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Solution for 21+4d=5 equation: 



21+4d=5

We move all terms to the left:

21+4d-(5)=0

We add all the numbers together, and all the variables

4d+16=0

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

4d=-16

d=-16/4

d=-4

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