Question

Помогите! решите уравнение :
-7x = -21
48x = -16
5x+9 = 0
5x+4 = x-12
4x-(6-x) = 13

Answer 1

1) x=21/7
x=3
2)x=-0,25
3)x=-1,8
4)x=-2
5)x=-13