Unable to help my child with this problem...

71.33=9/5k-459.67
solving for k

71.33=9/5k-459.67

71.33 + 459.67 = 9/5k

531 / (9/5) = k

531 * (5/9) = k

2655 / 9 = k

295 = k

What is 2 + 2 = 5 because u add it it gives u four but u have to add the plus I did this in my test I got an a +