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z[x+y]=xy
zx+zy=xy
zy=xy-zx
zy=x(y-z)
x=[zy]:[y-z]
z = xy : (x + y) |* (x + y)
z(x + y) = xy
zx + zy = xy
zx -xy = - zy
xy - xz = yz
x(y - z) = yz |: (y - z)
x = yz : (y - z)