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3x+4x-5+50+2x = 180
9x+45=180
9x=180-45
9x=135
x=135/9
x=15
sudut 1 = 3(15) =45°
sudut 2 = 4(15)-5 =55°
sudut 3 = 50 + 2(15)= 50+30=80°