Given the formula: x = (1 + a)/(1 - a) Solve for "a" when x=12.​

Question

Given the formula:

`x = (1 + a)/(1 - a)`
Solve for "a" when x=12.​

Answer 1

`12 = (1+a)/(1-a) => 12(1-a)= 1+ a \\=> 12 -12a = 1 + a => 12a+1 = 12-1 \\=> 13a = 11 => a= (11)/(13)`

ok done. Thank to me :>