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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5/X-2 = 4/7 // - 4/7
5/X-(4/7)-2 = 0
5/X-4/7-2 = 0
5*X^-1 = 18/7 // : 5
X^-1 = 18/35
-1 < 0
1/(X^1) = 18/35 // * X^1
1 = 18/35*X^1 // : 18/35
35/18 = X^1
X = 35/18
X = 35/18
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