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