Light and shadow

Solve your problem efficiently with Principle of Interaction of Inverses

thumb_principle of interaction of inverses

The entities involved in interaction of inverses may be a tangible object, such as a large 90 litre toughened plastic container of drinking water, it may be an object that you can't easily touch and see, such as Oxygen gas, or it can be a strong emotion such as anger, or it can even be such a simple thing as a mathematical variable $x$...

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