1]
[tex]8(x-7)=128 \ \ /:8\\\\x-7=16 \ \ /+7\\\\\huge\boxed{x=23}[/tex]
2]
[tex]16=2(x+7) \ \ /:2\\\\x+7=8 \ \ /-7\\\\\huge\boxed{x=1}[/tex]
3]
[tex]\frac{7y}{7}=20\\\\\huge\boxed{y=20}[/tex]
4]
[tex]2x-1=9 \ \ /+1\\\\2x=10 \ \ /:2\\\\\huge\boxed{x=5}[/tex]
5]
[tex]2(x-8)=20 \ \ /:2\\\\x-8=10 \ \ /+8\\\\\huge\boxed{x=18}[/tex]
