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x in (-oo:+oo)
(y/4)*z = x/w // - x/w
(y/4)*z-(x/w) = 0
1/4*y*z-w^-1*x = 0 // - 1/4*y*z
-w^-1*x = -(1/4*y*z) // : -w^-1
x = (-(1/4*y*z))/(-w^-1)
x = (-1/4*y*z)/(-w^-1)
x = (-1/4*y*z)/(-w^-1)
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