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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4 = (-50-10)/X // - (-50-10)/X
4-((-50-10)/X) = 0
60*X^-1 = -4 // : 60
X^-1 = -1/15
-1 < 0
1/(X^1) = -1/15 // * X^1
1 = -1/15*X^1 // : -1/15
-15 = X^1
X = -15
X = -15
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