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m in (-oo:+oo)
4*m-9 = 5*m-12 // - 5*m-12
4*m-(5*m)-9+12 = 0
4*m-5*m-9+12 = 0
3-m = 0 // - 3
-m = -3 // * -1
m = 3
m = 3
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