6(х+3)=2(x+23)
6x+18+2x+46
2x+46-6x=18
-4x+46=18
-4x=-28
x=7
5(y-4)=10(y-8)
5y-20=10y-80
5y-10y-80=20
-5y-80=20
-5y=100
y=-20
7(6-2t)=21(4-t)
42-14t=82-21t
14t+82-21t=42
-7t+82=42
-7t=-42
t=6
4(2z-8)=6(6+2z)
8z-32=36+12z
8z-(36+12z)=32
-4z-36=32
-4z=68
z=-14,5