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
