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10 November, 09:26

Indicate which property is illustrated in Step 3.

Step 1 = 12 + 9x - 12 - 4x + 3 = 12 + (9x - 12) - 4x + 3

Step 2 = 12 + (-12 + 9x) - 4x + 3

Step 3 = [12 + (-12) ] + (9x - 4x) + 3

Step 4 = 0 + (9x - 4x) + 3

Step 5 = (9x - 4x) + 3

Step 6 = (9 - 4) x + 3

Step 7 = 5x + 3

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Answers (1)
  1. 10 November, 12:23
    0
    Step 3 is the associative property of addition.

    The 12 and - 12 are grouped together.
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