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X in (-oo:+oo)
(1/3)*X = X-20 // - X-20
(1/3)*X-X+20 = 0
20-2/3*X = 0 // - 20
-2/3*X = -20 // : -2/3
X = -20/(-2/3)
X = 30
X = 30
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