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m in (-oo:+oo)
(1/2)*m+2/3 = 2*m-(1/12) // - 2*m-(1/12)
(1/2)*m-(2*m)+2/3+1/12 = 0
(1/2)*m-2*m+2/3+1/12 = 0
3/4-3/2*m = 0 // - 3/4
-3/2*m = -3/4 // : -3/2
m = -3/4/(-3/2)
m = 1/2
m = 1/2
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