Question

помогите
5•X=7(X-16)

Answer 1

5x=7(x-16)
5x=7x-112
5x-7x=-112
-2x=-112
x=-112:(-2)=56

Answer 2

5•X=7(X-16)
5х=7х-7*16
5х=7х-112
5х-7х= - 112
- 2х= - 112
х= -112:(-2)
  х= 56
5*56=7(56-16)
280=7*40
280=280