Solution:
Here, the denominators of the fractions are different (14 and 63).
To make these unlike fractions in to like fractions, we need a common denominator.
The least common denominator of 14 and 63 is 126.
So, the fractions,
[11/14] becomes [99/126]
and [43/63] becomes [86/126]
Now, [99/126] and [86/126] are like fractions.
So, [99/126] + [86/126] = [(99 + 86)/126]
= [185/126]
So, [11/14] + [43/63] = [185/126]