Jawabanmu

2014-03-28T17:36:06+07:00
2 (5x + 4) + 72 = 180 
10 x + 8 + 72 = 180
10x + 80 = 180
10x = 100
x = 10
1 1 1
2014-03-28T19:13:13+07:00
<BAD+2 <BDA=180
72+2(5x+4)      =180
72+10x+8      =180
80+10x    =180
x=180-80/10
x=10