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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
37/1990 = 3/X // - 3/X
37/1990-(3/X) = 0
37/1990-3*X^-1 = 0
-3*X^-1 = -37/1990 // : -3
X^-1 = 37/5970
-1 < 0
1/(X^1) = 37/5970 // * X^1
1 = 37/5970*X^1 // : 37/5970
5970/37 = X^1
X = 5970/37
X = 5970/37
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