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