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k in (-oo:+oo)
2/3 = (4/5)*k // - (4/5)*k
2/3-((4/5)*k) = 0
(-4/5)*k+2/3 = 0
2/3-4/5*k = 0 // - 2/3
-4/5*k = -2/3 // : -4/5
k = -2/3/(-4/5)
k = 5/6
k = 5/6
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