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k in (-oo:+oo)
5*k-(9/4) = 3 // - 3
5*k-(9/4)-3 = 0
5*k-9/4-3 = 0
5*k-21/4 = 0 // + 21/4
5*k = 21/4 // : 5
k = 21/4/5
k = 21/20
k = 21/20
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