Its very simple - follow the BODMAS RULE.
7(x-2) - 4x = 10
7x - 14 - 4x = 10
7x-4x = 10 + 14
3x = 24
therefore x = 24/3 = 8
hence x = 8.
7(x-2) - 4x = 10
7x - 14 - 4x = 10
7x-4x = 10 + 14
3x = 24
therefore x = 24/3 = 8
hence x = 8.