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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^3*((15*x^-2*(((2*x^2)^3)/5))/2) = 0
12*x^7 = 0 // : 12
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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