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n in (-oo:+oo)
1-(5*n) = 14/9 // - 14/9
1-(5*n)-(14/9) = 0
1-5*n-14/9 = 0
-5*n-5/9 = 0 // + 5/9
-5*n = 5/9 // : -5
n = 5/9/(-5)
n = -1/9
n = -1/9
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