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Mathematics, 15.07.2021 15:30 Tokkey12

Please answer fast!! What properties are being used in these expressions?

1. (3x+7)+(2x+8)=3x+7+2x+8
2. 3x+7+2x+8=3x+2x+7+8
3. 3x+2x+7+8=(3x+2x)+(7+8)

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Please answer fast!! What properties are being used in these expressions?

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