Jawabanmu

2014-09-12T13:11:45+07:00
5ab+8a-6ab+9c-19a+10-8ab
-9ab-11a+9c+10


2014-09-12T13:13:46+07:00
5ab - 8ab -6ab + 8a - 19a + 9c +10
 = -9ab - 11a + 9c +10