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How to simplify rational expression?

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Roseanncuaid
example  2   +  3    -1   
                8        8     8
first u going answer is 2/8+3/8 u add the numerator and copy the denominator=5/8,second is 5/8-1/8 u subtract the numerator and copy the denominator again=and the answer is 4/8 or 1/2