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  1. D

    3a + 6b = 60, how to solve this without using trial and error?

    the other equation is (a + b = 16)
  2. D

    3a + 6b = 60, how to solve this without using trial and error?

    the other equation is (a + b = 16)
  3. D

    3a + 6b = 60, how to solve this without using trial and error?

    the other equation is (a + b = 16)
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