math

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

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  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.

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