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