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7x + 75 = 180
180 - 75 = 7x
105 = 7x
x = 105
7
x = 15
2x° +(x +40)° +(4x +35)° = 180°
2x° +x° +40° +4x° +35° = 180°
2x° +x° +4x° +40° +35° = 180°
7x° +75° = 180°
7x° = 180° -75°
7x° = 105°
x = 105°/7°
x = 15°
Jadi, nilai dari x° adalah 15°.
Itu jawabannya.