Kali spent half of her weekly allowance on clothes. to earn more money her parents let her clean the gutters for $9. what is her weekly allowance if she ended with $13?

So to find the answer to this, you have to consider that  - half because half the pocket money (x) was spend on clothes, then plus 9 because that's how much extra she gained and 13 because that was the result of all the changes.

To solve this, first subtract 9 from both side, which leaves you with  and  is the same as , so to solve this, multiply both sides of the equation by two, resulting in . SO from this we can conclude that the weekly allowance is $8