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7x=180-35-40
7x=105
x=105/7
x= 15
Jadi, nilai x adalah 15
2x° + (x + 40)° + (4x + 35)° = 180°
7x° = 180° - 40° - 35°
7x° = 105°
x° = 105°
7
x° = 15°