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k in (-oo:+oo)
(1/10)*k-(1/15) = -1/5 // + -1/5
(1/10)*k-(1/15)-(-1/5) = 0
(1/10)*k-1/15+1/5 = 0
1/10*k+2/15 = 0 // - 2/15
1/10*k = -2/15 // : 1/10
k = -2/15/1/10
k = -4/3
k = -4/3
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