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