20211690 20211690
  • 21-09-2017
  • Mathematics
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4b + 21 = −3(b − 7) + 7b

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amirreza688 amirreza688
  • 21-09-2017
4b+21=-3b+21+7b
4b+21=4b+21
it means that the expression shows an identity
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