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D( x )
x = 0
x-0.02 = 0
x = 0
x = 0
x-0.02 = 0
x-0.02 = 0
x-0.02 = 0 // + 0.02
x = 0.02
x in (-oo:0) U (0:0.02) U (0.02:+oo)
2/x = 1.5/(x-0.02) // - 1.5/(x-0.02)
2/x-(1.5/(x-0.02)) = 0
2/x-1.5*(x-0.02)^-1 = 0
2/x-1.5/(x-0.02) = 0
(-1.5*x)/(x*(x-0.02))+(2*(x-0.02))/(x*(x-0.02)) = 0
2*(x-0.02)-1.5*x = 0
0.5*x-0.04 = 0
(0.5*x-0.04)/(x*(x-0.02)) = 0
(0.5*x-0.04)/(x*(x-0.02)) = 0 // * x*(x-0.02)
0.5*x-0.04 = 0
0.5*x-0.04 = 0 // + 0.04
0.5*x = 0.04 // : 0.5
x = 0.04/0.5
x = 0.08
x = 0.08
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