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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3 = (x-6.08)/x // - (x-6.08)/x
0.3-((x-6.08)/x) = 0
(-1*(x-6.08))/x+0.3 = 0
(-1*(x-6.08))/x+(0.3*x)/x = 0
0.3*x-1*(x-6.08) = 0
6.08-0.7*x = 0
(6.08-0.7*x)/x = 0
(6.08-0.7*x)/x = 0 // * x
6.08-0.7*x = 0
6.08-0.7*x = 0 // - 6.08
-0.7*x = -6.08 // : -0.7
x = -6.08/(-0.7)
x = 8.68571429
x = 8.68571429
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