21/5=3k-2/5

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Solution for 21/5=3k-2/5 equation: 


k in (-oo:+oo)

21/5 = 3*k-(2/5) // - 3*k-(2/5)

21/5-(3*k)+2/5 = 0

21/5-3*k+2/5 = 0

23/5-3*k = 0 // - 23/5

-3*k = -23/5 // : -3

k = -23/5/(-3)

k = 23/15

k = 23/15

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