1)2х + 3(5-Х)=15,5
2х+15-3х=15,5
2х-3х=15,5-15
-Х=0.5
2)15-4(7+2х)=1
15-28-8х=1
-8х=1-15+28
-8х=14
-Х=14/8
Х=-(14/8)
3)3(11+Х)-(2х-5)=11
33+3х-2х+5=11
3х-2х=11-33-5
Х=-27
4)5(3-2х)-8(Х-1)=3+22х
15-10х-8х+8=3+22х
-10х-8х-22х=3-15-8
-40х=-20
Х=-20/-40
Х=1/2(0,5)