The given fractions are:
[tex]\frac{5}{6x^7y^4},\frac{5}{3x^6y^3}[/tex]
It is required to find the least common denominator (LCD).
Recall that the least common denominator (LCD) is the smallest term that can be a common denominator for a set of fractions.
To find the LCD, find the least common multiple of the expressions in the denominators:
[tex]\begin{gathered} 6x^7y^4,3x^6y^3 \\ \text{ Take the LCM of the numbers and then the higher powers of the variables:} \\ LCD=6x^7y^4 \end{gathered}[/tex]
