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2x + 15° = 120°
2x = 120° - 15°
2x = 105°
x = 105°/2
x = 52,5°
26) 60 + 3x + 5 + 2x + 15 = 180 ..... saling berpelurus
5x + 80 = 180
5x = 180 - 80
5x = 100
x = 100/5
x = 20°