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k in (-oo:+oo)
25 = (27*k)/4 // - (27*k)/4
25-((27*k)/4) = 0
(-27/4)*k+25 = 0
25-27/4*k = 0 // - 25
-27/4*k = -25 // : -27/4
k = -25/(-27/4)
k = 100/27
k = 100/27
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