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X in (-oo:+oo)
100-X = X/(1/3) // - X/(1/3)
100-X-(X/(1/3)) = 0
100-X-3*X = 0
100-4*X = 0 // - 100
-4*X = -100 // : -4
X = -100/(-4)
X = 25
X = 25
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