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This might refer to the method used to solve an equation. Take, for example, the equation:

2x + 1 = 15

To solve this for x, the "x" must be isolated on the left. The multiplication and addition must be "undone" - that is, the inverse operation must be applied. Also, since multiplication is carried out before addition, this "undoing" should be applied in the inverse order - in this case, undo the addition first. What you end up doing, in this case, is first, subtract one from both sides, leaving you with:

2x = 14

and then, divide both sides by 2.

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Q: What does the phrase undoing the operations in reverse of the order of operations mean?
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