Given a random variable X, how would I find the probability that it is less than a certain value? No info is given about the distribution of X

Question

I'm given that $X$ is a random variable with density

$$f(x) = c * e^{−0.5*|x + 5|}$$ for x ∈ R.

How do I find a $t$ such that $P (X ≤ t) = 0.5$? I have no information on the distribution of X. The mod sign makes it even more confusing - do I have to take two cases of it being positive and negative?