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x in (-oo:+oo)
2*y-(2/z) = x // - x
2*y-x-(2/z) = 0
2*y-x-2*z^-1 = 0
2*y-x-2*z^-1 = 0 // - 2*y-2*z^-1
-x = -(2*y-2*z^-1) // * -1
x = 2*y-2*z^-1
x = 2*y-2*z^-1
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