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k in (-oo:+oo)
1/7 = k/4 // - k/4
1/7-(k/4) = 0
1/7-1/4*k = 0 // - 1/7
-1/4*k = -1/7 // : -1/4
k = -1/7/(-1/4)
k = 4/7
k = 4/7
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