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m in (-oo:+oo)
21/4 < 12-((3/4)*m) // - 12-((3/4)*m)
(3/4)*m+21/4-12 < 0
3/4*m-27/4 < 0 // + 27/4
3/4*m < 27/4 // : 3/4
m < 27/4/3/4
m < 9
m in (-oo:9)
(-oo:9)
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