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m in (-oo:+oo)
(-1/3)*m-(1/2) = -5/6 // + -5/6
(-1/3)*m-(1/2)-(-5/6) = 0
(-1/3)*m-1/2+5/6 = 0
1/3-1/3*m = 0 // - 1/3
-1/3*m = -1/3 // : -1/3
m = -1/3/(-1/3)
m = 1
m = 1
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