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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
-51/X = 3 // - 3
-51/X-3 = 0
-51*X^-1 = 3 // : -51
X^-1 = -1/17
-1 < 0
1/(X^1) = -1/17 // * X^1
1 = -1/17*X^1 // : -1/17
-17 = X^1
X = -17
X = -17
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