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k in (-oo:+oo)
-((1/3)*k)-3/5 = -14/15 // + -14/15
-((1/3)*k)-3/5-(-14/15) = 0
(-1/3)*k-3/5+14/15 = 0
1/3-1/3*k = 0 // - 1/3
-1/3*k = -1/3 // : -1/3
k = -1/3/(-1/3)
k = 1
k = 1
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