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D( X )
-6*X^2 = 0
-6*X^2 = 0
-6*X^2 = 0
-6*X^2 = 0 // : -6
X^2 = 0
X = 0
X in (-oo:0) U (0:+oo)
7/(-6*X^2) = 0
-7/6*X^-2 = 0 // : -7/6
X^-2 = 0
X naleu017Cy do O
X belongs to the empty set
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