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