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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)
1/(1-x) = 3.7 // - 3.7
1/(1-x)-3.7 = 0
1/(1-x)+(-3.7*(1-x))/(1-x) = 0
1-3.7*(1-x) = 0
3.7*x-2.7 = 0
(3.7*x-2.7)/(1-x) = 0
(3.7*x-2.7)/(1-x) = 0 // * 1-x
3.7*x-2.7 = 0
3.7*x-2.7 = 0 // + 2.7
3.7*x = 2.7 // : 3.7
x = 2.7/3.7
x = 0.72972973
x = 0.72972973
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