2/5d+18-d=21

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Solution for 2/5d+18-d=21 equation: 


d in (-oo:+oo)

(2/5)*d-d+18 = 21 // - 21

(2/5)*d-d-21+18 = 0

-3/5*d-3 = 0 // + 3

-3/5*d = 3 // : -3/5

d = 3/(-3/5)

d = -5

d = -5

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