Question

How to solve a-a+a+2a?

Answer 1

See explanation.

Explanation:

This expression cannot be solved because it is neither an equation nor an inequality.
You probably meant to simplify the expression.

The expression can be simplified to `3a`

`a-a+a+2a=a+2a=3a`

First we can see that `a` and `-a` are opposite, so their sum is zero, next `a` + `2a` is `3a` and this is the simplest form.

Answer 2

`3a`

Explanation:

Given: `a-a+a+2a`.

Notice how the first two terms cancel out.

`=color(red)cancelcolor(black)a-color(red)cancelcolor(black)a+a+2a`

`=a+2a`

Now, just add like-terms.

`=3a`