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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