Question

решите уравнение 7х-(3+2 х)=х+9

Answer 1

7x-3-2x=x+9
7x-2x-x=9+3
4x=12
x=3

Answer 2

7х - 3 - 2х = х +9
7х - 2х - х = 9 +3
4х = 12
х =3