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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)
7.4 = x/(1-x) // - x/(1-x)
7.4-(x/(1-x)) = 0
(-1*x)/(1-x)+7.4 = 0
(-1*x)/(1-x)+(7.4*(1-x))/(1-x) = 0
7.4*(1-x)-1*x = 0
7.4-8.4*x = 0
(7.4-8.4*x)/(1-x) = 0
(7.4-8.4*x)/(1-x) = 0 // * 1-x
7.4-8.4*x = 0
7.4-8.4*x = 0 // - 7.4
-8.4*x = -7.4 // : -8.4
x = -7.4/(-8.4)
x = 0.88095238
x = 0.88095238
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