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n in (-oo:+oo)
(-3/5)*n > -9 // + 9
(-3/5)*n+9 > 0
9-3/5*n > 0 // - 9
-3/5*n > -9 // : -3/5
n < -9/(-3/5)
n < 15
n in (-oo:15)
(-oo:15)
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