how to add unlike fractions?

“For the addition of unlike fractions, their equivalent fractions with a common denominator are found by taking the LCM of the denominators. Then, addition of the numerators is performed”.

Example: Let us find the value of .

The denominators are 7 and 14. Their L.C.M. can be calculated as follows.

LCM of 7 and 14 = 2 × 7 = 14