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x in (-oo:+oo)
4*u = (p/4)*(6*y-(5*q)) // - (p/4)*(6*y-(5*q))
4*u-((p/4)*(6*y-(5*q))) = 0
4*u-((p/4)*(6*y-5*q)) = 0
4*u-1*1/4*p*(6*y-5*q) = 0
4*u-1*1/4*p*(6*y-5*q) = 0
5/4*p*q-3/2*p*y+4*u = 0
5/4*p*q-3/2*p*y+4*u = 0
x belongs to the empty set
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