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Answer:
One you need to find a common factor
take the denominators and find a common factor such as 20. Now make sure that its the least common factor meaning that it is the lowest factor you can get. After you get your answers add them all together. MAKE SURE YOU ARE MULTIPLYING THE NUMERATOR AND THE DENOMINATOR!!! For example 4/6 and the common denominator is 4 you would do 4 time four and 4 times 6. I hope this helps good luck!