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n in (-oo:+oo)
7*n+7 = 126/11 // - 126/11
7*n-(126/11)+7 = 0
7*n-126/11+7 = 0
7*n-49/11 = 0 // + 49/11
7*n = 49/11 // : 7
n = 49/11/7
n = 7/11
n = 7/11
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