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m in (-oo:+oo)
(3/4)*m-5 < 16 // - 16
(3/4)*m-16-5 < 0
3/4*m-21 < 0 // + 21
3/4*m < 21 // : 3/4
m < 21/3/4
m < 28
m in (-oo:28)
(-oo:28)
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