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n in (-oo:+oo)
(-3*n)/9 < 9 // - 9
(-3*n)/9-9 < 0
-1/3*n-9 < 0 // + 9
-1/3*n < 9 // : -1/3
n > 9/(-1/3)
n > -27
n in (-27:+oo)
(-27:+oo)
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