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We need to find the LCM of the denominators, which are 6 and 7. To get LCM, list the prime factors of the numbers.

6 = 2 × 3

7 = 7

Then, just multiply the prime numbers, but not all (you'll understand better in the next example. ☺).

2 × 3 × 7 = 42

30 =

45 =

Multiply. 30 & 45 have common prime factor, which is 3 and 5, just multiply the numbers once. (The numbers are bold)

I hope that you'll understand it even if I haven't explained it well. ☺