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m in (-oo:+oo)
(3/2)*m = 12-((5/2)*m) // - 12-((5/2)*m)
(3/2)*m+(5/2)*m-12 = 0
4*m-12 = 0 // + 12
4*m = 12 // : 4
m = 12/4
m = 3
m = 3
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