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x in (-oo:+oo)
A = (7/2)*(h-45) // - (7/2)*(h-45)
A-((7/2)*(h-45)) = 0
(-7/2)*(h-45)+A = 0
A-7/2*(h-45) = 0
A-7/2*(h-45) = 0
A-7/2*h+315/2 = 0
A-7/2*h+315/2 = 0
x belongs to the empty set
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