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Invert the Operation:

Ex:

Operation;

5*6 = 30

Undo operation;

5= 30/6 OR 6 = 30/5

Operation;

10/2 = 5

Undo operation;

2*5 = 10 OR 5*2 = 10

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Answers.com

Ex:

Operation;

5*6 = 30

Undo operation;

5= 30/6 OR 6 = 30/5

Operation;

10/2 = 5

Undo operation;

2*5 = 10 OR 5*2 = 10

+1Answers.com

Answers.com

+1Answers.com

Answers.com

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12y ago

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