2х-1=4х+3
2х-4х=3+4
-2х=4
х=4:(-2)
х=-2
_____________
1/3у+2=-1/6у+5
1/3у+1/6у=5-2
1/2у=3
у=3:1/2
у=6
_____________
7х-1=2х-11
7х-2х=-11+1
5х=-10
х=-10:5
х=-2
____________
1/2у-3=-1/6у-7
1/2у+1/6у=-7+3
2/3у=-4
у=-4:2/3
у=-6
___________
3(х+4)=-4(х-3)
3х+12=-4х+12
3х+4х=12-12
7х=0
х=0:7
х=0
___________
3(х+2)-8(х-4)=-2
3х+6-8х+32=-2
3х-8х=-2-6-32
-5х=-40
х=-40:(-5)
х=8