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6x + 6 = 180
6x = 174
x = 29
sudut n= 2(29)- 6= 52
penyiku = 90 - 52 = 38
4x+12+2x-6=180
6x=172
x=28.7
penyiku N = 90 - (2 x 28.7 - 6) = 90 - 51.4= 38.6