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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/5 = 37/X // - 37/X
1/5-(37/X) = 0
1/5-37*X^-1 = 0
-37*X^-1 = -1/5 // : -37
X^-1 = 1/185
-1 < 0
1/(X^1) = 1/185 // * X^1
1 = 1/185*X^1 // : 1/185
185 = X^1
X = 185
X = 185
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