An individual's IUF is given by U(w) = ln(w), where w = current wealth. She is offered the opportunity to bet on the flip of a coin that results in heads with probability θ, where 0 < θ < 1. If she bets $x, she will end up having $(w + x) if heads occurs, and $(w - x) if tails occurs. Solve for the optimal value of x as a function of θ. What is her optimal choice of x when θ = 0.5? Can you offer an intuitive explanation in a sentence or two?