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x in (-oo:+oo)
d = (9/4)*(m-71) // - (9/4)*(m-71)
d-((9/4)*(m-71)) = 0
(-9/4)*(m-71)+d = 0
d-9/4*(m-71) = 0
d-9/4*(m-71) = 0
d-9/4*m+639/4 = 0
d-9/4*m+639/4 = 0
x belongs to the empty set
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