2/5d=21

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Solution for 2/5d=21 equation: 


d in (-oo:+oo)

(2/5)*d = 21 // - 21

(2/5)*d-21 = 0

2/5*d-21 = 0 // + 21

2/5*d = 21 // : 2/5

d = 21/2/5

d = 105/2

d = 105/2

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