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3x+2x = 180
5x = 180
x = 36°
(disubtitusi)
3x+3y = 180
3(36)+3y = 180
108+3y = 180
3y = 72
y = 24
》 x+y = 36+24 = 60°
15.
<DEF = <CBD (sehadap)
<ABC = 180-85 = 95°
yg 14 aku lupa caranya, maaf