It means that if your solving an eqation thenif you subtact it will get rid of the addition but whatever you do to one sside of an equation you must do to the other.
ex. x+5=9
-5 -5
x=4
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Inverse Operations: Divison undoes multiplication. Addition undoes subtraction. Subtraction undoes addition. Multiplication undoes division.
Inverse operations, or opposite operations, undo one another. Subtraction undoes addition (and vice versa), and division undoes multiplication (and vice versa).
Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.
Subtraction is the addition of a negative number.