The equation is:

$-x = 0$

To solve for $x$, multiply both sides of the equation by $-1$:

$x = 0$

So, the solution is $x = 0$.

Would you like further details or have any other questions?

Here are 5 related questions you might find useful:

1. What happens when you solve $-x = 5$?
2. How do you solve $x + 3 = 0$?
3. What is the solution to $-2x = 8$?
4. How do you solve $x - 7 = 0$?
5. Can you explain how to solve equations with multiple variables, like $x - y = 0$?

Tip: Always check your solution by substituting the value of the variable back into the original equation to verify it satisfies the equation.