What is 8x + - 13x I just want to see if the answers are as quick as it says it is

- 5x.

In case you actually want to know how I got it:

the question is just saying "8x - 13x".

8 - 13 = - 5

The answer is - 5x. Since your adding like terms it's just subtraction because they are different value integers, one is negative and one is positive. When two opposite integers ( + and - ) are being added it is just taking away from the negative what the positive value is. If the positive is greater than it may turn the answer into a positive. Example: 12+-2 = 10< - - changed