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m in (-oo:+oo)
3*m-9 = 6*m-12 // - 6*m-12
3*m-(6*m)-9+12 = 0
3*m-6*m-9+12 = 0
3-3*m = 0 // - 3
-3*m = -3 // : -3
m = -3/(-3)
m = 1
m = 1
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