21/3d=28

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Solution for 21/3d=28 equation: 


d in (-oo:+oo)

(21/3)*d = 28 // - 28

(21/3)*d-28 = 0

7*d-28 = 0 // + 28

7*d = 28 // : 7

d = 28/7

d = 4

d = 4

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