1/(1-x)=20

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Solution for 1/(1-x)=20 equation: 


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) = 20 // - 20

1/(1-x)-20 = 0

1/(1-x)+(-20*(1-x))/(1-x) = 0

1-20*(1-x) = 0

20*x-19 = 0

(20*x-19)/(1-x) = 0

(20*x-19)/(1-x) = 0 // * 1-x

20*x-19 = 0

20*x-19 = 0 // + 19

20*x = 19 // : 20

x = 19/20

x = 19/20

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