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D( x )
(0.75-(2*x))^2 = 0
(0.75-(2*x))^2 = 0
(0.75-(2*x))^2 = 0
(0.75-2*x)^2 = 0
0.75-2*x = 0 // - 0.75
-2*x = -0.75 // : -2
x = -0.75/(-2)
x = 0.375
x in (-oo:0.375) U (0.375:+oo)
(x^2)/((0.75-(2*x))^2) = 0
(x^2)/((0.75-2*x)^2) = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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