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