Jawabanmu

2014-08-24T22:20:48+07:00
12 + 2n = n - 10
2n - n = -10 - 12
n = -22
2014-08-24T22:21:35+07:00
12 + 2n = n -10
12+ 10 = n - 2n
22= -n
n= - 22