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N in (-oo:+oo)
N/8 < 20 // - 20
N/8-20 < 0
1/8*N-20 < 0 // + 20
1/8*N < 20 // : 1/8
N < 20/1/8
N < 160
N in (-oo:160)
(-oo:160)
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