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2d = 180 - 100
2d = 80
d = 40
4b + 20 = 2d
4b + 20 = 80
4b = 60
b = 15
4b + 20 + a = 180
60 + 20 + a = 180
80 + a = 180
a = 100
e + a = 180
e + 100 = 180
e = 80
3f + 10 = e
3f + 10 = 80
3f = 70
f = 23,3
2d + 4c - 20 = 180
80 + 4c - 20 = 180
4c = 120
c = 30