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D( x )
2-(2*x) = 0
2-(2*x) = 0
2-(2*x) = 0
2-2*x = 0
2-2*x = 0 // - 2
-2*x = -2 // : -2
x = -2/(-2)
x = 1
x in (-oo:1) U (1:+oo)
2/(2-(2*x)) = 2.167 // - 2.167
2/(2-(2*x))-2.167 = 0
2/(2-2*x)-2.167 = 0
2/(2-2*x)+(-2.167*(2-2*x))/(2-2*x) = 0
2-2.167*(2-2*x) = 0
4.334*x-2.334 = 0
(4.334*x-2.334)/(2-2*x) = 0
(4.334*x-2.334)/(2-2*x) = 0 // * 2-2*x
4.334*x-2.334 = 0
4.334*x-2.334 = 0 // + 2.334
4.334*x = 2.334 // : 4.334
x = 2.334/4.334
x = 0.53853253
x = 0.53853253
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