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K in (-oo:+oo)
12/7 = K/9 // - K/9
12/7-(K/9) = 0
12/7-1/9*K = 0 // - 12/7
-1/9*K = -12/7 // : -1/9
K = -12/7/(-1/9)
K = 108/7
K = 108/7
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