5. In a certain code language, '-' represents '+', '+' represents 'x', 'x' represents '÷' and '÷' represents '-'. Find out the answer to the following question. 2 - 12 + 10 x 5 ÷ 12 = ?
10. In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation. 7x6x8=678 8x9x7=987 6x5x7=567 5x4x6=?