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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
8/X = 66.6/100 // - 66.6/100
8/X-(66.6/100) = 0
8/X-0.666 = 0
8*X^-1 = 0.666 // : 8
X^-1 = 0.08325
-1 < 0
1/(X^1) = 0.08325 // * X^1
1 = 0.08325*X^1 // : 0.08325
12.01201201 = X^1
X = 12.01201201
X = 12.01201201
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