A)
[tex]12x - (2x + 1) = 9(2x - 1)[/tex]
[tex]12x - 2x - 1 = 18x - 9[/tex]
[tex]12x - 2x - 18x = - 9 + 1[/tex]
[tex] - 8x = - 8[/tex]
[tex]x = 1[/tex]
B)
[tex]2(x - 2) = x - 2[/tex]
[tex]2x - 4 = x - 2[/tex]
[tex]2x - x = - 2 + 4[/tex]
[tex]x = 2[/tex]
