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k in (-oo:+oo)
-k/2-2 = 3/2-(6*k)-3/4 // - 3/2-(6*k)-3/4
6*k-k/2-(-3/4)-(3/2)-2 = 0
6*k-k/2+3/4-3/2-2 = 0
11/2*k-11/4 = 0 // + 11/4
11/2*k = 11/4 // : 11/2
k = 11/4/11/2
k = 1/2
k = 1/2
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