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X in (-oo:+oo)
9.1 = X/3 // - X/3
9.1-(X/3) = 0
9.1-1/3*X = 0 // - 9.1
-1/3*X = -9.1 // : -1/3
X = -9.1/(-1/3)
X = 27.30000027
X = 27.30000027
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