Consider the steps to simplify the expression. What property of operation is used in Step 1?

Expression: -4 + 7 + (-3)

Step 1: = -4 + 7 + (-3)

Step 2: = -4 + (-3) + 7

Step 3: = -4 + (-) + (-3) + (-) + 7

Step 4: = -4 (-) + (-) + (-3) + 7

Step 5: = -4 + (-1) + (-3) + 7

Step 6: = -8 + 7

Step 7: = -1