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D( x )
1.15-x = 0
1.15-x = 0
1.15-x = 0
1.15-x = 0 // - 1.15
-x = -1.15 // * -1
x = 1.15
x in (-oo:1.15) U (1.15:+oo)
2 = ((2*x)/(1.15-x))*(1.15-x) // - ((2*x)/(1.15-x))*(1.15-x)
2-(((2*x)/(1.15-x))*(1.15-x)) = 0
2-2*x = 0
2-2*x = 0 // - 2
-2*x = -2 // : -2
x = -2/(-2)
x = 1
x = 1
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