Question

Реши уравнения 2x+9=13-x

Answer 1

2х+х=13-9
3х=4
х=4/3

...............

Answer 2

2х+х=13-9
3х=4
х=4/3

Answer 3

2x+9=13-x
2x+x=13-9
3x=4
x=4/3
x=1.(3)