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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
110 = 36/x // - 36/x
110-(36/x) = 0
110-36*x^-1 = 0
-36*x^-1 = -110 // : -36
x^-1 = 55/18
-1 < 0
1/(x^1) = 55/18 // * x^1
1 = 55/18*x^1 // : 55/18
18/55 = x^1
x = 18/55
x = 18/55
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