(7-5х)-(8-4х)+(5х+6)=8
(3-2х)+(4-3х)+(5-5х)=12+7х
(7-5х)-(8-4х)+(5х+6)=8 7-5х-8+4х+5х+6=8
4х=3
х=3/4
Ответ:3/4 (3-2х)+(4-3х)+(5-5х)=12+7х
3-2х+4-3х+5-5х=12+7х
17х=0
х=0
Ответ: 0