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x in (-oo:+oo)
(1/2)*(m-(3*n)) = 5 // - 5
(1/2)*(m-(3*n))-5 = 0
(1/2)*(m-3*n)-5 = 0
1/2*(m-3*n)-5 = 0
1/2*(m-3*n)-5 = 0
1/2*m-3/2*n-5 = 0
1/2*m-3/2*n-5 = 0
x belongs to the empty set
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