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k in (-oo:+oo)
(3/4)*k-6 = 5-2*k // - 5-2*k
(3/4)*k-(-2*k)-6-5 = 0
(3/4)*k+2*k-6-5 = 0
11/4*k-11 = 0 // + 11
11/4*k = 11 // : 11/4
k = 11/11/4
k = 4
k = 4
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