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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2.52/X = 2.35 // - 2.35
2.52/X-2.35 = 0
2.52*X^-1 = 2.35 // : 2.52
X^-1 = 0.93253968
-1 < 0
1/(X^1) = 0.93253968 // * X^1
1 = 0.93253968*X^1 // : 0.93253968
1.07234043 = X^1
X = 1.07234043
X = 1.07234043
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