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k in (-oo:+oo)
6*k-(4*k)-(12/8) = 0
6*k-4*k-3/2 = 0
2*k-3/2 = 0 // + 3/2
2*k = 3/2 // : 2
k = 3/2/2
k = 3/4
k = 3/4
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