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x in (-oo:+oo)
p-18 = (13/2)*(h-5) // - (13/2)*(h-5)
p-((13/2)*(h-5))-18 = 0
(-13/2)*(h-5)+p-18 = 0
p-13/2*(h-5)-18 = 0
p-13/2*(h-5)-18 = 0
p-13/2*h-18+65/2 = 0
p-13/2*h+29/2 = 0
p-13/2*h+29/2 = 0
x belongs to the empty set
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