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k in (-oo:+oo)
9/4-4*k = 7/4 // - 7/4
9/4-4*k-(7/4) = 0
9/4-4*k-7/4 = 0
1/2-4*k = 0 // - 1/2
-4*k = -1/2 // : -4
k = -1/2/(-4)
k = 1/8
k = 1/8
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