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D( x )
0.1-x = 0
0.1-x = 0
0.1-x = 0
0.1-x = 0 // - 0.1
-x = -0.1 // * -1
x = 0.1
x in (-oo:0.1) U (0.1:+oo)
3.16 = x/(0.1-x) // - x/(0.1-x)
3.16-(x/(0.1-x)) = 0
(-1*x)/(0.1-x)+3.16 = 0
(-1*x)/(0.1-x)+(3.16*(0.1-x))/(0.1-x) = 0
3.16*(0.1-x)-1*x = 0
0.316-4.16*x = 0
(0.316-4.16*x)/(0.1-x) = 0
(0.316-4.16*x)/(0.1-x) = 0 // * 0.1-x
0.316-4.16*x = 0
0.316-4.16*x = 0 // - 0.316
-4.16*x = -0.316 // : -4.16
x = -0.316/(-4.16)
x = 0.07596154
x = 0.07596154
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