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x in (-oo:+oo)
D = (1/2)*m-2 // - (1/2)*m-2
D-((1/2)*m)+2 = 0
D+(-1/2)*m+2 = 0
D-1/2*m+2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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