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n in (-oo:+oo)
(8*n)/(-9) = 16/18 // - 16/18
(8*n)/(-9)-(16/18) = 0
(8*n)/(-9)-8/9 = 0
-8/9*n-8/9 = 0 // + 8/9
-8/9*n = 8/9 // : -8/9
n = 8/9/(-8/9)
n = -1
n = -1
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