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