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X in (-oo:+oo)
(1/3)*X-((1/4)*X)+(1/12)*X = 3 // - 3
(1/3)*X-((1/4)*X)+(1/12)*X-3 = 0
(1/3)*X+(-1/4)*X+(1/12)*X-3 = 0
1/6*X-3 = 0 // + 3
1/6*X = 3 // : 1/6
X = 3/1/6
X = 18
X = 18
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