LEXIEXO
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  • 28-11-2018
  • Mathematics
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musiclover10045
musiclover10045 musiclover10045
  • 28-11-2018

In the second equation all the numbers are the numbers in the first equation multiplied by 9.

9a * 9 = 81a

8b * 9 = 72b

9c *9 = 81c


This means the answer should also be multiplied by 9:

-9 * 9 = -81

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