Jawabanmu

2014-02-21T18:54:16+07:00
3x+12=7x-8
12+8=7x-3x
4x=20
x=5

x+2=5+2=7

InsyaAllah begitu
2014-02-21T18:55:31+07:00
3x + 12 = 7x - 8 =
3x-7x = -8-12
-4x = -20
x = -20/-4 = 5
x+2 = 7