Jawabanmu

2014-04-24T17:43:30+07:00
<A+<D=180
5x-38+2x+15
5x+2x-38+15=180
7x-23=180
7x=180+23
7x=203
x=203/7=29

D =B
2x + 15 = B
2.29 + 15 = B
73 = B
<B = 73 derajat