х - 300 = 700

x = 1000

450 + c = 750

c = 300

y - 360 = 640

y = 1000

400 - c = 250

c = 150

57 + b = 100

b = 43

x + 150 = 1000

x = 850

420 - a = 350

a = 70

45 + c = 63

c = 18

x - 210 = 350

x = 560

y + 27 = 81

y = 54