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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*(40/1)*(49/20)*x^-12*x^2*x^10 = 0
3*40*(49/20)*x^-12*x^2*x^10 = 0
294 = 0
x belongs to the empty set
x belongs to the empty set
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