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m in (-oo:+oo)
(2/3)*m+1/2 = (2/3)*m-(2/3) // - (2/3)*m-(2/3)
(2/3)*m-((2/3)*m)+1/2+2/3 = 0
(2/3)*m+(-2/3)*m+1/2+2/3 = 0
7/6 = 0
m belongs to the empty set
m belongs to the empty set
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