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