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D( X )
8*X = 0
8*X = 0
8*X = 0
8*X = 0 // : 8
X = 0
X in (-oo:0) U (0:+oo)
-4 = -4/(8*X) // + -4/(8*X)
-(-4/(8*X))-4 = 0
(1/2)*X^-1-4 = 0
1/2*X^-1 = 4 // : 1/2
X^-1 = 8
-1 < 0
1/(X^1) = 8 // * X^1
1 = 8*X^1 // : 8
1/8 = X^1
X = 1/8
X = 1/8
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