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k in (-oo:+oo)
5*k-(2/4) = 5 // - 5
5*k-(2/4)-5 = 0
5*k-1/2-5 = 0
5*k-11/2 = 0 // + 11/2
5*k = 11/2 // : 5
k = 11/2/5
k = 11/10
k = 11/10
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