Hi there!!
Simplifying an expression is when you combine like terms.
Like terms are when at least two values have a variable in common or no variable at all. For example, 5x and 9x are like terms because both have X. 9y and 2x are not. 2xy and 9y are still not.
Moreover, if we were to simplify 3x+x+4x+2x, we can see that this expression is all like terms. SO we are going to simply add it all.
3x+x+4x+2x
3x+4x+2x
7x+2x
9x
9x is your final answer.
Hope this is helpful!
