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x in (-oo:+oo)
D = (7/2)*(m-99) // - (7/2)*(m-99)
D-((7/2)*(m-99)) = 0
(-7/2)*(m-99)+D = 0
D-7/2*(m-99) = 0
D-7/2*(m-99) = 0
D-7/2*m+693/2 = 0
D-7/2*m+693/2 = 0
x belongs to the empty set
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