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M in (-oo:+oo)
M/(-5) < -3 // + 3
M/(-5)+3 < 0
3-1/5*M < 0 // - 3
-1/5*M < -3 // : -1/5
M > -3/(-1/5)
M > 15
M in (15:+oo)
(15:+oo)
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