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