2x/(1-x)=7

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Solution for 2x/(1-x)=7 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)

(2*x)/(1-x) = 7 // - 7

(2*x)/(1-x)-7 = 0

(2*x)/(1-x)+(-7*(1-x))/(1-x) = 0

2*x-7*(1-x) = 0

9*x-7 = 0

(9*x-7)/(1-x) = 0

(9*x-7)/(1-x) = 0 // * 1-x

9*x-7 = 0

9*x-7 = 0 // + 7

9*x = 7 // : 9

x = 7/9

x = 7/9

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