How to simplifying expression's-4+7(3-m)
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2 Answers

Open the brackets (parentheses) by multiplying everything in them by 7: -4+7-21m (or -4+21-7m, depending on whether it's the title or context problem).
Now we combine the number constants: 3-21m (or 17-7m).
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Given -4+7(1-3m)

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