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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36 = 43/x // - 43/x
36-(43/x) = 0
36-43*x^-1 = 0
-43*x^-1 = -36 // : -43
x^-1 = 36/43
-1 < 0
1/(x^1) = 36/43 // * x^1
1 = 36/43*x^1 // : 36/43
43/36 = x^1
x = 43/36
x = 43/36
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