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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
133 = 36/x // - 36/x
133-(36/x) = 0
133-36*x^-1 = 0
-36*x^-1 = -133 // : -36
x^-1 = 133/36
-1 < 0
1/(x^1) = 133/36 // * x^1
1 = 133/36*x^1 // : 133/36
36/133 = x^1
x = 36/133
x = 36/133
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