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m in (-oo:+oo)
(12*m)/6+5 = 9-((13*m)/5) // - 9-((13*m)/5)
(12*m)/6+(13*m)/5-9+5 = 0
23/5*m-4 = 0 // + 4
23/5*m = 4 // : 23/5
m = 4/23/5
m = 20/23
m = 20/23
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