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k in (-oo:+oo)
7/48 = 3*k // - 3*k
7/48-(3*k) = 0
7/48-3*k = 0
7/48-3*k = 0 // - 7/48
-3*k = -7/48 // : -3
k = -7/48/(-3)
k = 7/144
k = 7/144
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