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x in (-oo:+oo)
X = 4*p+p/2+p/6-(p/90) // - 4*p+p/2+p/6-(p/90)
X-(4*p)-(p/2)-(p/6)+p/90 = 0
X-4*p-(p/2)-(p/6)+p/90 = 0
X-419/90*p = 0
x naleu017Cy do R
x in (-oo:+oo)
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