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m in (-oo:+oo)
-6 = 6*m-4*m+4 // - 6*m-4*m+4
-(-4*m)-(6*m)-6-4 = 0
4*m-6*m-6-4 = 0
-2*m-10 = 0 // + 10
-2*m = 10 // : -2
m = 10/(-2)
m = -5
m = -5
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