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m in (-oo:+oo)
2*m-5 = 3*m-12 // - 3*m-12
2*m-(3*m)-5+12 = 0
2*m-3*m-5+12 = 0
7-m = 0 // - 7
-m = -7 // * -1
m = 7
m = 7
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