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n in (-oo:+oo)
5*n = 11/4 // - 11/4
5*n-(11/4) = 0
5*n-11/4 = 0
5*n-11/4 = 0 // + 11/4
5*n = 11/4 // : 5
n = 11/4/5
n = 11/20
n = 11/20
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