Question 1094078
Using the identity log(a) - log(b) = log(a/b), we have
log2((x+1)/x) = log2(4)
Eliminate the logarithm:
2^(log2((x+1)/x)) = (x+1)/x = 2^(log2(4)) = 2^2 = 4
Solve for x:
x+1 = 4x 
x = 1/3