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m in (-oo:+oo)
2/3-((1/6)*m) = (1/6)*m-(2/3) // - (1/6)*m-(2/3)
2/3-((1/6)*m)-((1/6)*m)+2/3 = 0
(-1/6)*m+(-1/6)*m+2/3+2/3 = 0
4/3-1/3*m = 0 // - 4/3
-1/3*m = -4/3 // : -1/3
m = -4/3/(-1/3)
m = 4
m = 4
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