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m in (-oo:+oo)
4*m-9 = m/2 // - m/2
4*m-(m/2)-9 = 0
7/2*m-9 = 0 // + 9
7/2*m = 9 // : 7/2
m = 9/7/2
m = 18/7
m = 18/7
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