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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = (x-1+60000000)/x // - (x-1+60000000)/x
2-((x-1+60000000)/x) = 0
(-1*(x+59999999))/x+2 = 0
(-1*(x+59999999))/x+(2*x)/x = 0
2*x-1*(x+59999999) = 0
x-59999999 = 0
(x-59999999)/x = 0
(x-59999999)/x = 0 // * x
x-59999999 = 0
x-59999999 = 0 // + 59999999
x = 59999999
x = 59999999
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