Jawabanmu

2014-08-14T19:35:18+07:00
5X+7X-6y-2y+8z-9z-9z-10
jwb=11x-8y-10z-10
2014-08-14T19:40:18+07:00
(5x+7x)+(-6y-2y)+(8z-9z-9z)+10=12x-8y-10z