Maths Class 8th: Chap. 14 Ex. 14.3Part 5 Q no. (vii)Answer me 39^3(50y

This question was asked in Ex 14.3, 5 (vii)

Maths Class 8th: Chap. 14 Ex. 14.3
Part 5 Q no. (vii)
Answer me 39^3(50y^2-98)÷26y^3(5y 7)
78y^3(5y 7)(5y-7)÷26y^3(5y 7)
39 se 78 kaise hua?