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6x° +(40 +3x)° +(30 +x)° = 180°
6x +3x +x +40° +30° = 180°
10x +70° = 180°
10x = 180° -70°
10x = 110°
x = 110°/10
x = 11°
Jadi, nilai x adalah 11°.
Itu jawabannya.
10x + 70 = 180
10x = 180- 70
10x = 110
x = 110/10
x = 11