2х+3=х-6; z+4-3=2z; 5-3у=4-2у; 7-3х=4х-9; 6а-1=3а+7; 10у-3=5+3у

2х+3=х-6
2х-х=-6-3
х=-9

z+4-3=2z
4-3=2z-z
1=z

5-3y=4-2y
-3y+2y=4-5
-y=-1
y=1

7-3x=4x-9
-3x-4x=-9-7
-7x=-16
x=-16/-7
x=2,29

6a-1=3a+7
6a-3a=7-6
3a=1
a=1/3=0.33

10y-3=5+3y
10y-3y=5+3
7y=8
y=8/7=1.14