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k in (-oo:+oo)
(1/5)*(55-10*k) = 15*k+5 // - 15*k+5
(1/5)*(55-10*k)-(15*k)-5 = 0
(1/5)*(55-10*k)-15*k-5 = 0
1/5*(55-10*k)-15*k-5 = 0
1/5*(55-10*k)-15*k-5 = 0
11-17*k-5 = 0
6-17*k = 0
6-17*k = 0
6-17*k = 0 // - 6
-17*k = -6 // : -17
k = -6/(-17)
k = 6/17
k = 6/17
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