Once you have the equation, think about how to get $x$ alone: what should you do first to remove the $-7$ from $5x - 7$?

After you remove the $-7$, you will have an equation of the form $5x = \text{(some number)}$. What operation undoes multiplying by 5?

In Desmos, type y = 5x - 7 to graph the linear function $g(x)$.

On a new line, type y = 18 to graph a horizontal line representing $g(x) = 18$.

Click or tap on the point where the two lines intersect and read the $x$-coordinate of that point; that $x$-value is the solution to $5x - 7 = 18$ and matches one of the answer choices.

You are told that $g(x) = 5x - 7$ and asked for the value of $x$ when $g(x) = 18$.

Set the expression for $g(x)$ equal to 18:

To solve for $x$, first get rid of the $-7$ by adding 7 to both sides of the equation:

Now the equation is simpler and only has $x$ in the term $5x$.

Now divide both sides by 5 to solve for $x$:

So the value of $x$ that makes $g(x) = 18$ is $5$, which corresponds to choice B) 5.