Write each fraction in terms of the LCM of the denominators.

3x/x-7,6/x^2-49
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The LCM is x²-49 because x-7 is a factor. The other factor is x+7 so each fraction expressed withe the same denominator is  3x(x+7)/(x²-49) (or (3x²+21x)/(x²-49)) and 6/(x²-49) .

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