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x in (-oo:+oo)
l^3*m-((2/2)*l) = 4 // - 4
l^3*m-((2/2)*l)-4 = 0
l^3*m-l-4 = 0
l^3*m-l-4 = 0
x naleu017Cy do R
x in (-oo:+oo)
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