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Tom has 7/8 gallons of paint. He used 1/2 gallon of paint on a project. He uses the steps to show how much paint he had when he was done. But Tom's work is incorrect.

Step 1: 7/8 -1/2

Step 2: 7/8-1/8

Step 3: 8/8

Step 4: 3/4

Explain what Tom did wrong and find out what the answer should be.