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n in (-oo:+oo)
7*n = 77/17 // - 77/17
7*n-(77/17) = 0
7*n-77/17 = 0
7*n-77/17 = 0 // + 77/17
7*n = 77/17 // : 7
n = 77/17/7
n = 11/17
n = 11/17
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