there's a question that I don't understand and the direction says that

Question

'solve problems as combination integer problems.remember to rewrite all double sign problems as combination problems before solving' and here's a question 50- -61+ - 170 =

Answer 1

I believe they just want you to write it as

50 + 61 - 170 and then evaluate.

I find it puzzling why authors have to invent and come up with new language and new expressions of simple age-old problems.

Answer 2

Do not cheat and use this website!