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k in (-oo:+oo)
5/4 = (1*k)/2+3/4 // - (1*k)/2+3/4
5/4-((1*k)/2)-(3/4) = 0
5/4-(k/2)-3/4 = 0
1/2-1/2*k = 0 // - 1/2
-1/2*k = -1/2 // : -1/2
k = -1/2/(-1/2)
k = 1
k = 1
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