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3x+18=90
3x=90-18
x=72/3 =24
x=24
sudut abd= x+5 = 24+5 =29
2x+x = 90° - 5° - 13°
3x = 90° - 18°
3x = 72°
x = 72°/3
x = 24°
ABD = x + 5° = 24° + 5° = 29 °