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