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k in (-oo:+oo)
(4/5)*(4*k-1) = (5/4)*(3*k-2) // - (5/4)*(3*k-2)
(4/5)*(4*k-1)-((5/4)*(3*k-2)) = 0
(4/5)*(4*k-1)+(-5/4)*(3*k-2) = 0
4/5*(4*k-1)-5/4*(3*k-2) = 0
4/5*(4*k-1)-5/4*(3*k-2) = 0
17/10-11/20*k = 0
17/10-11/20*k = 0
17/10-11/20*k = 0 // - 17/10
-11/20*k = -17/10 // : -11/20
k = -17/10/(-11/20)
k = 34/11
k = 34/11
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