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You'll need at least two expressions to find something in common between them.
Basically, simplifying can apply to any sort of expression from something as simple as division, or something complicated like an equation. Simplifying can be like reducing 5/10 to 1/2 or reducing 10x+5y+25 to 2x+y+5. You divide the expression by a common term, such as two or five in the previous problems
Greatest Common Factor .... largest expression which (evenly) divides into the given expressions.
a common factor
To find the common factor when factorising, look for any common factors that can be divided evenly from all the terms in the expression. Divide each term by this common factor, and then factorise the resulting expression further if possible. This will help simplify the expression and make it easier to work with.