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Because people who made up these expressions want to make life easier! ENJOY

By writing an expression in its simplest form, it makes it as easy as possible to understand it. For example, if you write out

12(x - y)y2x-2x2(x-3y-2x3)/(4)(x-y)

Then you'll have very little luck understanding it. However, if you simplify this expression, you simply get

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14y ago

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