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K in (-oo:+oo)
3/21 = K/14 // - K/14
3/21-(K/14) = 0
1/7-1/14*K = 0 // - 1/7
-1/14*K = -1/7 // : -1/14
K = -1/7/(-1/14)
K = 2
K = 2
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