Sudut bertolak belakang sama besar.
a = b
→ 5x + 10° = 110°
→ 5x = 110° - 10°
→ 5x = 100°
→ x = 20°
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Sudut bertolak belakang sama besar.
a = b
→ 5x + 10° = 110°
→ 5x = 110° - 10°
→ 5x = 100°
→ x = 20°