change sides, change signs

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change sides, change signs

A mnemonic used in mathematics to remember that when adding or subtracting a value from one side of an equation, you must apply the opposite value to the other side. Well, here's the problem. You tried to solve the equation by subtracting X from both sides. If you're subtracting X from one side, you must add X to the other side. Remember—change sides, change signs!
See also: change, sign
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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