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m in (-oo:+oo)
m/2 >= 3 // - 3
m/2-3 >= 0
1/2*m-3 >= 0 // + 3
1/2*m >= 3 // : 1/2
m >= 3/1/2
m >= 6
m in <6:+oo)
<6:+oo)
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