book Maths Puzzle Numerical Ability

I am having trouble with this question, Find the Lowest Common Denominator of

3 7
---- and ------
x^3 xy^4

I think the answer is

xy^4

Am I right, Can someone let me know?

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book Other Question
hi kim when you see an algrebric expression how do uyou know what number to add or subtract to both sides. (4xsquared - y to the 4th)