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x in (-oo:+oo)
(1/9)*(2*m-16) = (1/3)*(2*n+4) // - (1/3)*(2*n+4)
(1/9)*(2*m-16)-((1/3)*(2*n+4)) = 0
(1/9)*(2*m-16)+(-1/3)*(2*n+4) = 0
1/9*(2*m-16)-1/3*(2*n+4) = 0
1/9*(2*m-16)-1/3*(2*n+4) = 0
2/9*m-2/3*n-28/9 = 0
2/9*m-2/3*n-28/9 = 0
x belongs to the empty set
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