х = 9+d
y = x+d = 9+2d
z = y+d = 9+3d
13 = z+d = 9+4d ---> d = 1
x = 10
y = 11
z = 12
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х = 9+d
y = x+d = 9+2d
z = y+d = 9+3d
13 = z+d = 9+4d ---> d = 1
x = 10
y = 11
z = 12