How to write a equivalent expression

Number 1
7(y + 2)
= (7 × y) + (7 × 2)
= 7y + 14 (this is the equivalent expression)

Number 2
8(2a - 4)
= (8 × 2a) - (8 × 4)
= 16a - 32 (this is the equivalent expression)

Number 3
(8 + 5)(b × 8)
= 13(8b) (this is the equivalent expression)
= 104b (this is also the equivalent expression)