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D( x )
x+0.96 = 0
x+0.96 = 0
x+0.96 = 0
x+0.96 = 0 // - 0.96
x = -0.96
x in (-oo:-0.96) U (-0.96:+oo)
(0.84-x)/(x+0.96) = 0.203 // - 0.203
(0.84-x)/(x+0.96)-0.203 = 0
(0.84-x)/(x+0.96)+(-0.203*(x+0.96))/(x+0.96) = 0
0.84-0.203*(x+0.96)-x = 0
0.64512-1.203*x = 0
(0.64512-1.203*x)/(x+0.96) = 0
(0.64512-1.203*x)/(x+0.96) = 0 // * x+0.96
0.64512-1.203*x = 0
0.64512-1.203*x = 0 // - 0.64512
-1.203*x = -0.64512 // : -1.203
x = -0.64512/(-1.203)
x = 0.53625935
x = 0.53625935
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