2^(x)/(1-2^(x))=3

2^x / (1 - 2^x) = 3

2^x = 3 - 3*2^x
4*2^x = 3
2^(x+2) = 3
(x+2) ln 2 = ln 3
x+2 = ln3/ln2
x = ln3/ln2 - 2
= -0.4150