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Verified answer
Karena satu garis itu bernilai 180° maka180=3x+5x+20
180=8x+20
180-20=8x
160=8x
160:8=x
20=x
maaf kalo jawabannya salah
Verified answer
3x + 5x + 20 = 1803x+5x = 180-20
8x = 160
x=20