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m in (-oo:+oo)
m/4-5 < 5/4-(m/5) // - 5/4-(m/5)
m/4+m/5-(5/4)-5 < 0
m/4+m/5-5/4-5 < 0
9/20*m-25/4 < 0 // + 25/4
9/20*m < 25/4 // : 9/20
m < 25/4/9/20
m < 125/9
m in (-oo:125/9)
(-oo:125/9)
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