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k in (-oo:+oo)
3/8 = 9*k // - 9*k
3/8-(9*k) = 0
3/8-9*k = 0
3/8-9*k = 0 // - 3/8
-9*k = -3/8 // : -9
k = -3/8/(-9)
k = 1/24
k = 1/24
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