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D( x )
20*x = 0
20*x = 0
20*x = 0
20*x = 0 // : 20
x = 0
x in (-oo:0) U (0:+oo)
(-15*x^2)/(20*x) = 0
-3/4*x = 0 // : -3/4
x = 0
x in { 0}
x belongs to the empty set
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