20-(5-4х)=3
20-5+4х=3
15+4х=3
4х=-12
х=-3
20-(5-4*(-3))=3
3=3
2(0,5-4х)=2х+7
1-8х=2х+7
-8х-2х=7-1
-10х=6
-х=6/10
х=-0,6
3(3х-2)+11=7+10х
9х-6+11=7+10х
9х-10х=7+6-11
-х=2
х=-2
14-(-5+2х)=-3
14+5-2х=-3
-2х=-3-14-5
-2х=-22
х=11
-5(y-3)=11-(2y-1)
-5y+15=11-2y+1
-5y+2y=11+1-15
-3y=-3
y=1
4,4y-3(8-3y)=5,4y+4
4,4y-24+9y=5,4y+4
4,4y+9y-5,4y=4+24
8y=28
y=28:8