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x in (-oo:+oo)
z = w*((x+y)/3) // - w*((x+y)/3)
z-(w*((x+y)/3)) = 0
(-1*w*(x+y))/3+z = 0
(-1*w*(x+y))/3+(3*z)/3 = 0
3*z-1*w*(x+y) = 0
3*z-(w*x)-(w*y) = 0
(3*z-(w*x)-(w*y))/3 = 0
(3*z-(w*x)-(w*y))/3 = 0 // * 3
3*z-(w*x)-(w*y) = 0
3*z-w*x-(w*y) = 0 // - 3*z-(w*y)
-w*x = -(3*z-(w*y)) // : -w
x = (-(3*z-(w*y)))/(-w)
x = -(w^-1*(w*y-(3*z)))
x = -(w^-1*(w*y-(3*z)))
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