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m in (-oo:+oo)
m/(-100) > 9 // - 9
m/(-100)-9 > 0
-1/100*m-9 > 0 // + 9
-1/100*m > 9 // : -1/100
m < 9/(-1/100)
m < -900
m in (-oo:-900)
(-oo:-900)
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