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k in (-oo:+oo)
25 = (27*k)/36 // - (27*k)/36
25-((27*k)/36) = 0
(-3/4)*k+25 = 0
25-3/4*k = 0 // - 25
-3/4*k = -25 // : -3/4
k = -25/(-3/4)
k = 100/3
k = 100/3
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