3x + 12 = 7x -8
3x - 7x = -8 - 12
-4x = -20
x = -20/-4
x = 5

x + 2 = 5 + 2 = 7
3x + 12 = 7x – 8
12+8=7x+3x
20=10x
10x=20
x=20/10
x=2
tinggal dimasukkin aja
x+2
=2+2
=4

Jawabanmu

2014-01-17T16:17:39+07:00
3x + 12 = 7x -8
3x - 7x = -8 - 12
-4x = -20
x = -20/-4
x = 5

x + 2 = 5 + 2 = 7

gomenasai ._.
60 4 60
2014-01-17T16:24:17+07:00
3x+12=7x-8
12+8=7x-3x
20=4x
x=5

x+2=5+2=7

16 3 16