8=4/(1-r)

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Solution for 8=4/(1-r) equation: 


D( r )

1-r = 0

1-r = 0

1-r = 0

1-r = 0 // - 1

-r = -1 // * -1

r = 1

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

8 = 4/(1-r) // - 4/(1-r)

8-(4/(1-r)) = 0

8-4*(1-r)^-1 = 0

8-4/(1-r) = 0

(8*(1-r))/(1-r)-4/(1-r) = 0

8*(1-r)-4 = 0

4-8*r = 0

(4-8*r)/(1-r) = 0

(4-8*r)/(1-r) = 0 // * 1-r

4-8*r = 0

4-8*r = 0 // - 4

-8*r = -4 // : -8

r = -4/(-8)

r = 1/2

r = 1/2

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