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n in (-oo:+oo)
8-(7*n) = 39/11 // - 39/11
8-(7*n)-(39/11) = 0
8-7*n-39/11 = 0
49/11-7*n = 0 // - 49/11
-7*n = -49/11 // : -7
n = -49/11/(-7)
n = 7/11
n = 7/11
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