Answer:
x = 16
Explanation:
Assuming the question is asking to solve for 
 ,
,
We can translate the statement "three less than x is equal to 13" into:

- Three less than x is "x" minus 3
- equals to 13 means "=" 13
Thus we can write 
 [as above]
 [as above]
Solving for x gives us:

x is 16