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98 = 3x-7
105 = 3x
35 drjt = x
35.) kedua sudut itu jumlahnya 180 drjt karena berhadapan
5x + 3 + 102 = 180
5x + 105 = 180
5x = 75
x = 15 drjt
98° + 7° = 3x
105° = 3x
x = 105/3
x = 35 (B)
35.) <ABC + <BCD = 180°
102° + 5x + 3° = 180°
105° + 5x = 180°
5x = 180 - 105
5x = 75
x = 75/5
x = 15 (C)