
First, we have to find HCF of 657 and 963
Now, 657 = 9*63
963 = 9*107
HCF(657, 963) = 9
Since HCF is expressed in the form of 657x + 963x - 15
So, 657x + 963x - 15 = 9
=> 657x + 963x - 15 = 9
=> 1620x - 15 = 9
=> 1620x = 15 + 9
=> 1620x = 24
=> x = 24/1620
=> x = 2/135 {24 and 1620 is divided by 12}
So, the value of x is 2/135