Jawabanmu

2014-02-11T18:21:20+07:00
9 - x = x - 7
-2x= -7-9
-x= -16/3
-x = -8
x = 8

insya allah benar :)
2014-02-11T18:23:14+07:00
9 -x = x -7
9 -x + x = x -7 + 7
9 + 7 = x + x
16 = 2x
(1/2)16 = (1/2)2x
8 = x / x = 8