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D( x )
x-0.04 = 0
x-0.04 = 0
x-0.04 = 0
x-0.04 = 0 // + 0.04
x = 0.04
x in (-oo:0.04) U (0.04:+oo)
30 = 3/(x-0.04) // - 3/(x-0.04)
30-(3/(x-0.04)) = 0
30-3*(x-0.04)^-1 = 0
30-3/(x-0.04) = 0
(30*(x-0.04))/(x-0.04)-3/(x-0.04) = 0
30*(x-0.04)-3 = 0
30*x-4.2 = 0
(30*x-4.2)/(x-0.04) = 0
(30*x-4.2)/(x-0.04) = 0 // * x-0.04
30*x-4.2 = 0
30*x-4.2 = 0 // + 4.2
30*x = 4.2 // : 30
x = 4.2/30
x = 0.14
x = 0.14
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