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k in (-oo:+oo)
(2/5)*(3*k-10) = 15 // - 15
(2/5)*(3*k-10)-15 = 0
2/5*(3*k-10)-15 = 0
2/5*(3*k-10)-15 = 0
6/5*k-19 = 0
6/5*k-19 = 0
6/5*k-19 = 0 // + 19
6/5*k = 19 // : 6/5
k = 19/6/5
k = 95/6
k = 95/6
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