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12x + 12 = 180
12x = 180 - 12
12x = 168
x = 14
= 7 . 14 + 8
= 98 + 8
= 106˚
18) jumlah perbandingan = 4 + 5 = 9
sudut terbesar = 5/9 x 90˚
= 50˚