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OpenStudy (delaneyparris):
Indicate which property is illustrated in Step 3. Step 1 5x + 7 + 3x + 12 = (5x + 7) + (3x + 12) Step 2 = 5x + (7 + 3x) + 12 Step 3 = 5x + (3x + 7) + 12 Step 4 = (5x + 3x) + (7 + 12) Step 5 = (5 + 3)x + (7 + 12) Step 6 = 8x + 19
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