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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-2)/x = 120 // - 120
(x-2)/x-120 = 0
(x-2)/x+(-120*x)/x = 0
x-120*x-2 = 0
-119*x-2 = 0
(-119*x-2)/x = 0
(-119*x-2)/x = 0 // * x
-119*x-2 = 0
-119*x-2 = 0 // + 2
-119*x = 2 // : -119
x = 2/(-119)
x = -2/119
x = -2/119
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