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7*m^2-(4*m)-n^2-(m*((4*n)/2))-(2*n)-8 = 0
7*m^2-4*m-n^2-2*m*n-2*n-8 = 0
7*m^2-4*m-n^2-2*n-2*m*n-8 = 0
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x in (-oo:+oo)
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