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X in (-oo:+oo)
(2/3)*X+20 = 100*X // - 100*X
(2/3)*X-(100*X)+20 = 0
(2/3)*X-100*X+20 = 0
20-298/3*X = 0 // - 20
-298/3*X = -20 // : -298/3
X = -20/(-298/3)
X = 30/149
X = 30/149
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