4/(1-x)=7/(1+x)

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Solution for 4/(1-x)=7/(1+x) equation: 


D( x )

1-x = 0

x+1 = 0

1-x = 0

1-x = 0

1-x = 0 // - 1

-x = -1 // * -1

x = 1

x+1 = 0

x+1 = 0

x+1 = 0 // - 1

x = -1

x in (-oo:-1) U (-1:1) U (1:+oo)

4/(1-x) = 7/(x+1) // - 7/(x+1)

4/(1-x)-(7/(x+1)) = 0

4/(1-x)-7*(x+1)^-1 = 0

4/(1-x)-7/(x+1) = 0

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

4*(x+1)-7*(1-x) = 0

11*x-3 = 0

(11*x-3)/((1-x)*(x+1)) = 0

(11*x-3)/((1-x)*(x+1)) = 0 // * (1-x)*(x+1)

11*x-3 = 0

11*x-3 = 0 // + 3

11*x = 3 // : 11

x = 3/11

x = 3/11

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