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In order to subtract the rational expressions, we have to first find their common denominator.

The LCM of 6 and 3 is 6.

Here the first term, 5x/6 has the denominator as ‘6’ so the term stays the same.

For the second term, multiply the numerator and the denominator by ‘2’ to get the common denominator ‘6’==> (2x* 2)/ (3* 2)= 4x/6

Now, 5x/6 – 4x/6 = (5x- 4x)/6 = x/6.

In order to subtract the rational expressions, we have to first find their common denominator.

The LCM of 2 and 5 is 10.

For the first term, multiply the numerator and the denominator by ‘5’ to get the common denominator ‘10’->(3a* 5)/ (2* 5) = 15a/10.

Similarly, for the second term multiply the numerator and the denominator by ‘2’ to get the common

denominator ‘10’==> (4a* 2)/ (5* 2) = 8a/10

Now we have, 15a/10 – 8a/10= (15a- 8a)/10= 7a/10.