Question

Уравнение помогите пж!
640/(5k+4+7k)=16

Answer 1

640/12k+4=16
640/4(3k+1)=16
160/3k+1=16/1
3k+1=160/16
3k=9
k=3

Answer 2

640/(5k+4+7k)=16

16(12к+4) = 640
12к+4 = 40
12к = 36
к = 3