2]
[tex]2x-12=6 \ \ |+12\\\\2x=18 \ \ |:2\\\\x=9[/tex]
3]
[tex]4+5x=34 \ \ |-4\\\\5x=30 \ \ |:5\\\\x=6[/tex]
4]
[tex]-8x+10=4 \ \ |-10\\\\-8x=-6 \ \ |:(-8)\\\\x=0,75[/tex]
5]
[tex]9-x=21 \ \ |-9\\\\-x=12 \ \ |:(-1)\\\\x=-12[/tex]
6]
[tex]\frac{1}{3}x-4=5 \ \ |+4\\\\\frac{1}{3}x=9 \ \ |\cdot3\\\\x=27[/tex]
