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m in (-oo:+oo)
6-m = 3*m-2 // - 3*m-2
2-m-(3*m)+6 = 0
2-m-3*m+6 = 0
8-4*m = 0 // - 8
-4*m = -8 // : -4
m = -8/(-4)
m = 2
m = 2
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