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k in (-oo:+oo)
36 = (27*k)/25 // - (27*k)/25
36-((27*k)/25) = 0
(-27/25)*k+36 = 0
36-27/25*k = 0 // - 36
-27/25*k = -36 // : -27/25
k = -36/(-27/25)
k = 100/3
k = 100/3
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