What: "Doing a mathematical operation on an equation is like adding weights to or removing weights from the pans of a weighing balance. A balanced equation is like a weighing balance with equal weights on both its pans, in which case the arm of the balance is exactly horizontal. If we add the same weights to both the pans, the arm remains horizontal. Similarly, if we remove the same weights from both the pans, the arm remains horizontal. On the other hand if we add different weights to the pans or remove different weights from them, the balance is tilted; that is, the arm of the balance does not remain horizontal."

Writer: Prajit Mittal

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Where:

Date: Jul 17 2013 5:17 PM