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By watching this video you can learn how to subtract two fractions and the video also explains an example with stepwise solution and get more help with subtract fractions - http://math.tutorvista.com/number-system/subtracting-fractions.html

From the video you can learn how to build a variable expressions from the given phrase and the video explains you an example which is solved step by step you can also get help with similar topics such as Adding and Subtracting Rational Expressions - http://math.tutorvista.com/algebra/adding-and-subtracting-rational-expressions.html