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m in (-oo:+oo)
-m/5 < -20 // + 20
20-m/5 < 0
20-1/5*m < 0 // - 20
-1/5*m < -20 // : -1/5
m > -20/(-1/5)
m > 100
m in (100:+oo)
(100:+oo)
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