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