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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
3
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w - 9 is in its simplest form.
reducing it
simplify it, reduce it
It is in its simplest form when all terms in the rational expression have a highest common factor of 1
4b - 3