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k in (-oo:+oo)
3/5+7/10 = (11/15)*k-(2/5) // - (11/15)*k-(2/5)
3/5-((11/15)*k)+7/10+2/5 = 0
(-11/15)*k+3/5+7/10+2/5 = 0
17/10-11/15*k = 0 // - 17/10
-11/15*k = -17/10 // : -11/15
k = -17/10/(-11/15)
k = 51/22
k = 51/22
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