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x in (-oo:+oo)
D = (9/4)*(m-25) // - (9/4)*(m-25)
D-((9/4)*(m-25)) = 0
(-9/4)*(m-25)+D = 0
D-9/4*(m-25) = 0
D-9/4*(m-25) = 0
D-9/4*m+225/4 = 0
D-9/4*m+225/4 = 0
x belongs to the empty set
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