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k in (-oo:+oo)
1/4-(k/9) = 5/36 // - 5/36
1/4-(k/9)-(5/36) = 0
1/4-(k/9)-5/36 = 0
1/9-1/9*k = 0 // - 1/9
-1/9*k = -1/9 // : -1/9
k = -1/9/(-1/9)
k = 1
k = 1
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