Sue solved an equation incorrectly, as shown below:
Step 1: 7x = 28
Step 2: x = 28 - 7
Step 3: x = 21
Which statement best explains why Step 2 is incorrect in Sue's solution?
She did not multiply 28 seven times.
She did not divide 28 by 7.
She did not multiply 28 by 7.
She did not add 7 to 28.
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