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K in (-oo:+oo)
-9*K = -1/3 // + -1/3
-9*K-(-1/3) = 0
1/3-9*K = 0
1/3-9*K = 0 // - 1/3
-9*K = -1/3 // : -9
K = -1/3/(-9)
K = 1/27
K = 1/27
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