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