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n in (-oo:+oo)
(1/5)*n = 3.1 // - 3.1
(1/5)*n-3.1 = 0
1/5*n-3.1 = 0 // + 3.1
1/5*n = 3.1 // : 1/5
n = 3.1/1/5
n = 15.5
n = 15.5
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