А)(5x-3)+(7x-4)=8-(15-11x) б)(4х++11)=7+(13-4х) в)(7--4х)+(5х+6)=8 г)(3-2х)+(4-3х)+(5-5х)=12+7х

А)
(5х-3)+(7х-4)=8-(15-11х)
5х-3+7х-4=8-15+11х
5х+7х-11х=8-15+3+4
х=0
б)
(4х+3)-(10х+11)=7+(13-4х)
4х+3-10х-11=7+13-4х
4х-10х+4х=20-3+11
-2х=28
х=28/-2
х=-14
в)
(7-5х)-(8-4х)+(5х+6)=8
7-5х-8+4х+5х+6=8
4х=8-5
4х=3
х=3/4
х=0,75
г)
(3-2х)+(4-3х)+(5-5х)=12+7х
3-2х+4-3х+5-5х=12+7х
-10х-7х=12-12
-17х=0
х=0