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x in (-oo:+oo)
r = (7/8)*(p+7*q) // - (7/8)*(p+7*q)
r-((7/8)*(p+7*q)) = 0
(-7/8)*(p+7*q)+r = 0
r-7/8*(p+7*q) = 0
r-7/8*(p+7*q) = 0
r-7/8*p-49/8*q = 0
r-7/8*p-49/8*q = 0
x belongs to the empty set
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