21-4d=8

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Solution for 21-4d=8 equation: 



21-4d=8

We move all terms to the left:

21-4d-(8)=0

We add all the numbers together, and all the variables

-4d+13=0

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

-4d=-13

d=-13/-4

d=3+1/4

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