21/15=3k/5-2/5

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Solution for 21/15=3k/5-2/5 equation: 


k in (-oo:+oo)

21/15 = (3*k)/5-(2/5) // - (3*k)/5-(2/5)

21/15-((3*k)/5)+2/5 = 0

(-3/5)*k+21/15+2/5 = 0

9/5-3/5*k = 0 // - 9/5

-3/5*k = -9/5 // : -3/5

k = -9/5/(-3/5)

k = 3

k = 3

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