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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-2 = 39-37 // - 39-37
X/x-39-2+37 = 0
X*x^-1 = 4 // : X
x^-1 = 4/X
-1 < 0
1/(x^1) = 4/X // * x^1
1 = (4/X)*x^1 // : 4/X
1/(4/X) = x^1
x = 1/(4/X)
x = 1/(4/X)
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