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m in (-oo:+oo)
m/(-10) > 8 // - 8
m/(-10)-8 > 0
-1/10*m-8 > 0 // + 8
-1/10*m > 8 // : -1/10
m < 8/(-1/10)
m < -80
m in (-oo:-80)
(-oo:-80)
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