Jawabanmu

2014-02-06T20:17:16+07:00
3x + 12 = 7x - 8
3x - 7x = -8 - 12
     -4x = -20
         x = 5
x+2 = 5 + 2 = 7
2014-02-06T20:17:56+07:00
3x + 12= 7x -8
3x - 7x = -8 - 12
-4x = -20
x = -20/-4
x= 5

x+2 = 5 + 2 = 7