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n in (-oo:+oo)
4*n-(1/5) = 19/5 // - 19/5
4*n-(1/5)-(19/5) = 0
4*n-1/5-19/5 = 0
4*n-4 = 0 // + 4
4*n = 4 // : 4
n = 4/4
n = 1
n = 1
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