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D( x )
0.068-(2*x) = 0
0.068-(2*x) = 0
0.068-(2*x) = 0
0.068-2*x = 0
0.068-2*x = 0 // - 0.068
-2*x = -0.068 // : -2
x = -0.068/(-2)
x = 0.034
x in (-oo:0.034) U (0.034:+oo)
0.018 = x/(0.068-(2*x)) // - x/(0.068-(2*x))
0.018-(x/(0.068-(2*x))) = 0
0.018-(x/(0.068-2*x)) = 0
(-1*x)/(0.068-2*x)+0.018 = 0
(-1*x)/(0.068-2*x)+(0.018*(0.068-2*x))/(0.068-2*x) = 0
0.018*(0.068-2*x)-1*x = 0
0.001224-1.036*x = 0
(0.001224-1.036*x)/(0.068-2*x) = 0
(0.001224-1.036*x)/(0.068-2*x) = 0 // * 0.068-2*x
0.001224-1.036*x = 0
0.001224-1.036*x = 0 // - 0.001224
-1.036*x = -0.001224 // : -1.036
x = -0.001224/(-1.036)
x = 0.00118147
x = 0.00118147
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