Simonne used the following steps to simplify the given expression.
12 - 3 (-2x + 4)
Step 1: 12 + (-3) · (-2x) + (-3) · (4)
Step 2: 12 + 6x + (-12)
Step 3: 12 + (-12) + 6x
Step 4: 0 + 6x
Step 5: 6x
What property of real numbers was used to transition from Step 3 to Step 4?
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