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m in (-oo:+oo)
12 = 4*m-m+6 // - 4*m-m+6
m-(4*m)-6+12 = 0
m-4*m-6+12 = 0
6-3*m = 0 // - 6
-3*m = -6 // : -3
m = -6/(-3)
m = 2
m = 2
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