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X in (-oo:+oo)
(-2/6)*X = 8/18 // - 8/18
(-2/6)*X-(8/18) = 0
(-2/6)*X-4/9 = 0
-1/3*X-4/9 = 0 // + 4/9
-1/3*X = 4/9 // : -1/3
X = 4/9/(-1/3)
X = -4/3
X = -4/3
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