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k in (-oo:+oo)
5*k-(1/2) = 9/2 // - 9/2
5*k-(1/2)-(9/2) = 0
5*k-1/2-9/2 = 0
5*k-5 = 0 // + 5
5*k = 5 // : 5
k = 5/5
k = 1
k = 1
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