The given expression involves addition, multiplication, and subtraction. According to the order of operations, multiplication should be performed before addition and subtraction. Therefore, we first calculate 1.2 multiplied by 10, which equals 12. Then, we calculate 1.4 multiplied by 5, which equals 7. Finally, we subtract 7 from 12, resulting in 5. Since we are left with only one number, which is 5, the answer is 5.