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−5r+8r+5

-5r+8r=3r then you add the 5 to the 3r because you cannot add them if it does both have the r. the answer is 3r+5

-5r + 8r + 5

We must combine like terms.

That basically just means that we add anything that has any like variables :)

In this case, our like terms are the variable "r."

So, we must add -5r to 8r

Think of this as if there were no "r" in there.

So, it looks like this : -5 + 8

What's -5 + 8?

It's 3! So, now we just need to add an 'r' after the 3.

So, -5r + 8r = 3r

Since we have no more like terms, our answer is :

3r + 5

~Hope I helped!~