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k in (-oo:+oo)
8/7 = 12*k // - 12*k
8/7-(12*k) = 0
8/7-12*k = 0
8/7-12*k = 0 // - 8/7
-12*k = -8/7 // : -12
k = -8/7/(-12)
k = 2/21
k = 2/21
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