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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
7.3 = (2*x)/(1-x) // - (2*x)/(1-x)
7.3-((2*x)/(1-x)) = 0
7.3-2*x*(1-x)^-1 = 0
(-2*x)/(1-x)+7.3 = 0
(-2*x)/(1-x)+(7.3*(1-x))/(1-x) = 0
7.3*(1-x)-2*x = 0
7.3-9.3*x = 0
(7.3-9.3*x)/(1-x) = 0
(7.3-9.3*x)/(1-x) = 0 // * 1-x
7.3-9.3*x = 0
7.3-9.3*x = 0 // - 7.3
-9.3*x = -7.3 // : -9.3
x = -7.3/(-9.3)
x = 0.78494624
x = 0.78494624
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