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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
32.89/X = 85/100 // - 85/100
32.89/X-(85/100) = 0
32.89/X-17/20 = 0
32.89*X^-1 = 17/20 // : 32.89
X^-1 = 0.02584372
-1 < 0
1/(X^1) = 0.02584372 // * X^1
1 = 0.02584372*X^1 // : 0.02584372
38.69411989 = X^1
X = 38.69411989
X = 38.69411989
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