Expected runs in Bernoulli trials

Consider a sequence of independent Bernoulli trials, where $\frac{3}{4}$ is the probability of success in each trial. Let $X$ be a random variable defined as follows: If the first trial is a success, then $X$ counts the number of failures before the next success. If the first trial is a failure, then $X$ counts the number of successes before the next failure. Then $2E(X)$ equals __________