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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X-6)/x = 0.35 // - 0.35
(X-6)/x-0.35 = 0
(X-6)/x+(-0.35*x)/x = 0
X-0.35*x-6 = 0
(X-0.35*x-6)/x = 0
(X-0.35*x-6)/x = 0 // * x
X-0.35*x-6 = 0
X-0.35*x-6 = 0 // - X-6
-0.35*x = -(X-6) // : -0.35
x = (-(X-6))/(-0.35)
x = -2.85714286*(6-X)
x = -2.85714286*(6-X)
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