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x in (-oo:+oo)
u = x-(u/o) // - x-(u/o)
u+u/o-x = 0
o^-1*u+u-x = 0 // - o^-1*u+u
-x = -(o^-1*u+u) // * -1
x = o^-1*u+u
x = o^-1*u+u
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