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5x-10=90°
5x=100°
X=20°
Maka besar sudut boc = 2.20+5
40+5=45° (C)
Smg mmbantuu:)
3x = 90 - 15
3x = 75
x = 75/3
x = 25
jadi, (3x - 15)° = 3(25) - 15
= 75 - 15
= 60
jawaban : D