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x in (-oo:+oo)
(m/4+n/3)*((3*m)/4-((2*n)/3)) = 0
(m/4+n/3)*((3*m)/4+(-2/3)*n) = 0
(1/4*m+1/3*n)*(3/4*m-2/3*n) = 0
x belongs to the empty set
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