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x in (-oo:+oo)
(1/4)*(8*m-(4*n))+(1/3)*(6*m+3*n) = 0
(1/4)*(8*m-4*n)+(1/3)*(6*m+3*n) = 0
1/4*(8*m-4*n)+1/3*(6*m+3*n) = 0
1/4*(8*m-4*n)+1/3*(6*m+3*n) = 0
4*m = 0
4*m = 0
x belongs to the empty set
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