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