Hi there!
Let us solve the equation step-for-step.
Simplify both sides of the equation. It would look like this -
x² - 7x = 0
Then, we factor the left side of the equation. It will look like what you started with.
x (x - 7) = 0
Finally, set factors equal to zero.
x = 0 or x - 7 = 0
x can equal 7 or 0. It does not matter because both answers will give you the same outcome.
Hope this helps! :D