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x+2x+9+2x-29=180
x+2x+2x+9-29=180
5x-20=180
5x=180+20
5x=200
x=200:5
x=40
b.
sudut1. 40°
sudut2. (2x+9)=2(40)+9=80+9=89°
sudut3. (2x-29)=2(40)-29=80-29=51°