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4a = 180
a = 45
b + b + b = 180
3b = 180
b = 60
3c + 45 + 30 = 180
3c = 180 - 30 - 45
3c = 105
c = 35
4d + 60 + d = 180
5d = 180 - 60
5d = 120
d = 24