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m in (-oo:+oo)
m/(-15) < -19 // + 19
m/(-15)+19 < 0
19-1/15*m < 0 // - 19
-1/15*m < -19 // : -1/15
m > -19/(-1/15)
m > 285
m in (285:+oo)
(285:+oo)
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