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m in (-oo:+oo)
(3*m)/5 < 3/20 // - 3/20
(3*m)/5-(3/20) < 0
(3*m)/5-3/20 < 0
3/5*m-3/20 < 0 // + 3/20
3/5*m < 3/20 // : 3/5
m < 3/20/3/5
m < 1/4
m in (-oo:1/4)
(-oo:1/4)
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