[tex]12 x - 18 = 48\\12 x = 48 + 18\\12 x = 66 \\x = 66/12 = 5.5 \\\\36 + 5 x = 70 \\5 x = 70 - 36 \\5 x = 34\\x = 34/5 \\\\x/6 + 9 = 20 .5 \\x /6 = 123/6 - 54/6 \\x = 123 - 54 \\x = 69\\\\23 - 8 x = 16 \\- 8 x = 16 - 23 \\- 8 x = - 7 \\x = 7/8 \\\\- 4 x + 23 = 45 \\- 4 x = 45 - 23 \\- 4 x = 22 \\x = 11/2 \\\\3 x /7 - 73 = - 28 \\3 x / 7 = - 196/ 7 + 511/7 \\3 x = 315\\x = 105 \\[/tex]