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x in (-oo:+oo)
(1/125)^3-(2*x) = 125 // - 125
(1/125)^3-(2*x)-125 = 0
(1/125)^3-2*x-125 = 0
-2*x-244140624/1953125 = 0 // + 244140624/1953125
-2*x = 244140624/1953125 // : -2
x = 244140624/1953125/(-2)
x = -122070312/1953125
x = -122070312/1953125
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