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x in (-oo:+oo)
p-18 = (31/4)*(h-7) // - (31/4)*(h-7)
p-((31/4)*(h-7))-18 = 0
(-31/4)*(h-7)+p-18 = 0
p-31/4*(h-7)-18 = 0
p-31/4*(h-7)-18 = 0
p-31/4*h-18+217/4 = 0
p-31/4*h+145/4 = 0
p-31/4*h+145/4 = 0
x belongs to the empty set
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