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k in (-oo:+oo)
2*k-(5/2) = 2 // - 2
2*k-(5/2)-2 = 0
2*k-5/2-2 = 0
2*k-9/2 = 0 // + 9/2
2*k = 9/2 // : 2
k = 9/2/2
k = 9/4
k = 9/4
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