2х+3(х-3)=31 ; (х+1)×3+4х=24

Question

2х+3(х-3)=31 ; (х+1)×3+4х=24

Answer 1

2х+3(х-3)=31,
2х+3х-9=31,
5х-9=31,
5х=31+9,
5х=40,
х=40:5,
х=8.
Ответ: 8.

(х+1)×3+4х=24,
3х+3+4х=24,
7х+3=24,
7х=24-3,
7х=21,
х=21:7,
х=3.
Ответ: 3.