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x in (-oo:+oo)
V = x/r // - x/r
V-(x/r) = 0
V-r^-1*x = 0 // - V
-r^-1*x = -V // : -r^-1
x = -V/(-r^-1)
x = V/(r^-1)
x = V/(r^-1)
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