To solving with the equation from step by step.
First add 9 to from the both sides.
5x−9+9=11+9
And the equals to 5x=20
Finally step to divide from the both sides of 5.
5x/5 as a fraction it equals 20/5 as a fraction
it equals to x=4
Answer is x=4
It will help you.
Have a great day.