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12x = 180 -108
12x = 72
x = 72/12
x = 6
* 56 + 5x + 2y = 180
56 + 5×6 + 2y = 180
56 + 30 + 2y = 180
86 + 2y = 180
2y = 180 - 86
2y = 94
y = 94/2
y = 47
* 12x + 56 + 4z = 180
12×6 + 56 + 4z = 180
72 + 56 + 4z = 180
128 + 4z = 180
4z = 180 - 128
4z = 52
z = 52/4
z = 13
Jadi, x + y + z = 6 + 47 + 13
= 66