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x in (-oo:+oo)
D = (7/5)*(m-66) // - (7/5)*(m-66)
D-((7/5)*(m-66)) = 0
(-7/5)*(m-66)+D = 0
D-7/5*(m-66) = 0
D-7/5*(m-66) = 0
D-7/5*m+462/5 = 0
D-7/5*m+462/5 = 0
x belongs to the empty set
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