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D( x )
0.75-x = 0
0.75-x = 0
0.75-x = 0
0.75-x = 0 // - 0.75
-x = -0.75 // * -1
x = 0.75
x in (-oo:0.75) U (0.75:+oo)
1.6 = x/(0.75-x) // - x/(0.75-x)
1.6-(x/(0.75-x)) = 0
(-1*x)/(0.75-x)+1.6 = 0
(-1*x)/(0.75-x)+(1.6*(0.75-x))/(0.75-x) = 0
1.6*(0.75-x)-1*x = 0
1.2-2.6*x = 0
(1.2-2.6*x)/(0.75-x) = 0
(1.2-2.6*x)/(0.75-x) = 0 // * 0.75-x
1.2-2.6*x = 0
1.2-2.6*x = 0 // - 1.2
-2.6*x = -1.2 // : -2.6
x = -1.2/(-2.6)
x = 0.46153846
x = 0.46153846
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