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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)
49.7 = ((2*x)/(1-x))*(2-x) // - ((2*x)/(1-x))*(2-x)
49.7-(((2*x)/(1-x))*(2-x)) = 0
49.7-2*x*(1-x)^-1*(2-x) = 0
(-2*x*(2-x))/(1-x)+49.7 = 0
(-2*x*(2-x))/(1-x)+(49.7*(1-x))/(1-x) = 0
49.7*(1-x)-2*x*(2-x) = 0
2*x^2-53.7*x+49.7 = 0
2*x^2-53.7*x+49.7 = 0
2*x^2-53.7*x+49.7 = 0
DELTA = (-53.7)^2-(2*4*49.7)
DELTA = 53.7^2-397.6
DELTA = 2486.09
DELTA > 0
x = ((53.7^2-397.6)^(1/2)+53.7)/(2*2) or x = (53.7-(53.7^2-397.6)^(1/2))/(2*2)
x = ((53.7^2-397.6)^(1/2)+53.7)/4 or x = (53.7-(53.7^2-397.6)^(1/2))/4
(x-((53.7-(53.7^2-397.6)^(1/2))/4))*(x-(((53.7^2-397.6)^(1/2)+53.7)/4)) = 0
((x-((53.7-(53.7^2-397.6)^(1/2))/4))*(x-(((53.7^2-397.6)^(1/2)+53.7)/4)))/(1-x) = 0
((x-((53.7-(53.7^2-397.6)^(1/2))/4))*(x-(((53.7^2-397.6)^(1/2)+53.7)/4)))/(1-x) = 0 // * 1-x
(x-((53.7-(53.7^2-397.6)^(1/2))/4))*(x-(((53.7^2-397.6)^(1/2)+53.7)/4)) = 0
( x-(((53.7^2-397.6)^(1/2)+53.7)/4) )
x-(((53.7^2-397.6)^(1/2)+53.7)/4) = 0 // + ((53.7^2-397.6)^(1/2)+53.7)/4
x = ((53.7^2-397.6)^(1/2)+53.7)/4
( x-((53.7-(53.7^2-397.6)^(1/2))/4) )
x-((53.7-(53.7^2-397.6)^(1/2))/4) = 0 // + (53.7-(53.7^2-397.6)^(1/2))/4
x = (53.7-(53.7^2-397.6)^(1/2))/4
x in { ((53.7^2-397.6)^(1/2)+53.7)/4, (53.7-(53.7^2-397.6)^(1/2))/4 }
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