Hey there... Let's solve this question by steps..
5x - 9 = 16 --> your real question
Step 1 - adding 9 to both sides so that x term is alone on one side
5x - 9 + 9 = 16 + 9
5x = 25
Step 2 - dividing both sides 5 to get the value of x
x = 5
So, value of x = 5
hope this helped you... :-)