1. The problem is to simplify or evaluate the expression $3x - 1$. 2. This is a linear algebraic expression where $3x$ means 3 times the variable $x$, and then subtract 1. 3. Without a specific value for $x$, the expression remains $3x - 1$. 4. If you want to evaluate it for a particular $x$, substitute that value and perform the multiplication and subtraction. 5. For example, if $x=2$, then $3(2) - 1 = 6 - 1 = 5$. 6. So, the expression $3x - 1$ is simplified as is, or can be evaluated by substituting a value for $x$.