Jawabanmu

2014-02-10T19:36:22+07:00
3x+12 = 7x-8
20 = 4x
x = 5 maka x+2 = 5+2 = 7
2014-02-10T19:41:15+07:00
3x+12=7x-8
3x-7x=-8-12
-4x=-20
x=-20:-4
x=5

x+2=5+2
     =7