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n in (-oo:+oo)
5*n = 23/4 // - 23/4
5*n-(23/4) = 0
5*n-23/4 = 0
5*n-23/4 = 0 // + 23/4
5*n = 23/4 // : 5
n = 23/4/5
n = 23/20
n = 23/20
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