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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 20-((3*x)/x) // - 20-((3*x)/x)
(3*x)/x-20+2 = 0
-15 = 0
x belongs to the empty set
x belongs to the empty set
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