R.B., have you got your flameproof suit on ? Please answer the following questions for me, if you'd be so kind.
1. Is the comma in common American use instead of the decimal point ? I know that it is in much of Europe, but not here in England.
2. Is the use of a calculator permitted ?
3. I regret that, being English, I do not know what age group "8th grade" covers. Please enlighten me so that I may make comparison with my own first contact with algebra.
4. Please be aware of the right way to spell "correctly" , "similar" and "root" (as in "square root").
5. What is a "like fraction" ?
Yes, I know I'm an evil and ancient pedant, but to raise the subject of education it is best to be educated, at least to a level appropriate to one's age. Am I right in assuming that you are indeed somewhat youthful ?
Assuming that the answer to questions 1 and 2 is "yes", then I get an answer to your arithmetical question of -26,580.23 using English conventional separators.