Jawabanmu

2014-03-18T20:36:51+07:00
4(2/4x +30)=2(1/2x +40)
2(
2/4x +30) = 1/2x +40
1/x + 60 = 1/2x + 40
2 + 120x = 1 + 80x
40x = -1
x = -1/40

maaf kalo salah
2014-03-18T20:38:30+07:00