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180 = 108 + 12x
12x = 180-108
12x = 72
x = 6
cari y
180 = 56 + 5x + 2y
180 = 56 + 5 (6) + 2y
180 = 56 + 30 + 2y
2y = 180 - 86
2y = 94
y = 94/2
y = 47
cari z
180 = 12 x + 56 + 4z
180 = 72 + 56 + 4z
180 = 138 + 4z
4z = 180 - 138
4z = 52
z = 52/4
z = 13