Question

Помогите пожалуйста с математикой,

 

2(х-4)- 1.2(х+7)= -0.4

 

Answer 1

2(x-4)-1.2(x+7)=-0.4
2x-8-1.2x-8.4=-0.4
2x-1.2x=-0.4+8+8.4
0.8x=16
x=20

Answer 2

2х-8-1.2х+8.4=-0.4
2х-1.2х=-0.4-8-8.4
0.8х=-16.8
х=-16.8/0.8
х=21

Answer 3

Проверка:2*-21=-42-8-25.2+8.4=-0.4