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D( x )
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:1/5) U (1/5:+oo)
X/(5*x-1) = 3.2/14.4 // - 3.2/14.4
X/(5*x-1)-(3.2/14.4) = 0
X/(5*x-1)-0.22222222 = 0
X/(5*x-1)+(-0.22222222*(5*x-1))/(5*x-1) = 0
X-0.22222222*(5*x-1) = 0
X-1.1111111*x+0.22222222 = 0
(X-1.1111111*x+0.22222222)/(5*x-1) = 0
(X-1.1111111*x+0.22222222)/(5*x-1) = 0 // * 5*x-1
X-1.1111111*x+0.22222222 = 0
X-1.1111111*x+0.22222222 = 0 // - X+0.22222222
-1.1111111*x = -(X+0.22222222) // : -1.1111111
x = (-(X+0.22222222))/(-1.1111111)
x = 0.90000001*(X+0.22222222)
x = 0.90000001*(X+0.22222222)
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