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X in (-oo:+oo)
-X/3 = 0.2 // - 0.2
-X/3-0.2 = 0
-1/3*X-0.2 = 0 // + 0.2
-1/3*X = 0.2 // : -1/3
X = 0.2/(-1/3)
X = -0.60000001
X = -0.60000001
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