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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
86/X = 98/100 // - 98/100
86/X-(98/100) = 0
86/X-49/50 = 0
86*X^-1 = 49/50 // : 86
X^-1 = 49/4300
-1 < 0
1/(X^1) = 49/4300 // * X^1
1 = 49/4300*X^1 // : 49/4300
4300/49 = X^1
X = 4300/49
X = 4300/49
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