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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
6*7*y^0*x^(-1/6)*x^(2/3) = 0
6*7*x^(-1/6)*x^(2/3) = 0
42*x^(1/2) = 0 // : 42
x^(1/2) = 0
x = 0
x in { 0}
x belongs to the empty set
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