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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(0.2/13)*x^-6*x^20 = 0
0.01538462*x^14 = 0 // : 0.01538462
x^14 = 0
x = 0
x in { 0}
x belongs to the empty set
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