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x in (-oo:+oo)
p-25 = (15/4)*(h-18-4) // - (15/4)*(h-18-4)
p-((15/4)*(h-18-4))-25 = 0
(-15/4)*(h-18-4)+p-25 = 0
p-15/4*(h-22)-25 = 0
p-15/4*(h-22)-25 = 0
p-15/4*h-25+165/2 = 0
p-15/4*h+115/2 = 0
p-15/4*h+115/2 = 0
x belongs to the empty set
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