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m in (-oo:+oo)
(9/2)*m-8 = 4*m-5.5 // - 4*m-5.5
(9/2)*m-(4*m)-8+5.5 = 0
(9/2)*m-4*m-8+5.5 = 0
1/2*m-2.5 = 0 // + 2.5
1/2*m = 2.5 // : 1/2
m = 2.5/1/2
m = 5
m = 5
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