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n in (-oo:+oo)
6*n = 30/11 // - 30/11
6*n-(30/11) = 0
6*n-30/11 = 0
6*n-30/11 = 0 // + 30/11
6*n = 30/11 // : 6
n = 30/11/6
n = 5/11
n = 5/11
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