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x in (-oo:+oo)
d = (t^2)/2+6*t // - (t^2)/2+6*t
d-((t^2)/2)-(6*t) = 0
d-((t^2)/2)-6*t = 0
d-1/2*t^2-6*t = 0
x naleu017Cy do R
x in (-oo:+oo)
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