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n in (-oo:+oo)
30 > (2/1)*n // - (2/1)*n
30-((2/1)*n) > 0
30-2*n > 0
30-2*n > 0 // - 30
-2*n > -30 // : -2
n < -30/(-2)
n < 15
n in (-oo:15)
(-oo:15)
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