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n in (-oo:+oo)
5*n+1/9 = 91/9 // - 91/9
5*n+1/9-(91/9) = 0
5*n+1/9-91/9 = 0
5*n-10 = 0 // + 10
5*n = 10 // : 5
n = 10/5
n = 2
n = 2
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