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n in (-oo:+oo)
1/5-n-(7*n) = -359/5 // + -359/5
1/5-n-(7*n)-(-359/5) = 0
1/5-n-7*n+359/5 = 0
72-8*n = 0 // - 72
-8*n = -72 // : -8
n = -72/(-8)
n = 9
n = 9
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