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X in (-oo:+oo)
(1/2)*X = 4/12 // - 4/12
(1/2)*X-(4/12) = 0
(1/2)*X-1/3 = 0
1/2*X-1/3 = 0 // + 1/3
1/2*X = 1/3 // : 1/2
X = 1/3/1/2
X = 2/3
X = 2/3
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