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