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n in (-oo:+oo)
(11/2)*n+1/5 = 31/5 // - 31/5
(11/2)*n+1/5-(31/5) = 0
(11/2)*n+1/5-31/5 = 0
11/2*n-6 = 0 // + 6
11/2*n = 6 // : 11/2
n = 6/11/2
n = 12/11
n = 12/11
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