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x in (-oo:+oo)
A = (9/4)*(h-72) // - (9/4)*(h-72)
A-((9/4)*(h-72)) = 0
(-9/4)*(h-72)+A = 0
A-9/4*(h-72) = 0
A-9/4*(h-72) = 0
A-9/4*h+162 = 0
A-9/4*h+162 = 0
x belongs to the empty set
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