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x in (-oo:+oo)
a = (9/2)*(h-99) // - (9/2)*(h-99)
a-((9/2)*(h-99)) = 0
(-9/2)*(h-99)+a = 0
a-9/2*(h-99) = 0
a-9/2*(h-99) = 0
a-9/2*h+891/2 = 0
a-9/2*h+891/2 = 0
x belongs to the empty set
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