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x in (-oo:+oo)
(v/8)*x = w/y // - w/y
(v/8)*x-(w/y) = 0
1/8*v*x-(w*y^-1) = 0 // + w*y^-1
1/8*v*x = w*y^-1 // : 1/8*v
x = (w*y^-1)/(1/8*v)
x = 8*v^-1*w*y^-1
x = 8*v^-1*w*y^-1
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