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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
140 = 180*((x-2)/x) // - 180*((x-2)/x)
140-(180*((x-2)/x)) = 0
140-180*x^-1*(x-2) = 0
140-180*x^-1*(x-2) = 0
360*x^-1-40 = 0
360*x^-1-40 = 0
360*x^-1 = 40 // : 360
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x = 9
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