The sum of three consecutive integers is 15. What are the integers?
When solving algebraic problems, the first thing we have to do is define a variable for stuff that we don't know. In this problem, we don't know any of the integers, so we assign a variable to them.
Let's have the first integer be
The illustrate this concept, consider the integers
We're told that the sum of our three integers is
Solving this equation is pretty straightforward:
That means our first integer is