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