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n in (-oo:+oo)
5*(2*n+1) = 115 // - 115
5*(2*n+1)-115 = 0
5*(2*n+1)-115 = 0
10*n-110 = 0
10*n-110 = 0
10*n-110 = 0 // + 110
10*n = 110 // : 10
n = 110/10
n = 11
n = 11
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