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X in (-oo:+oo)
X/2-3 = 3/9 // - 3/9
X/2-(3/9)-3 = 0
X/2-1/3-3 = 0
1/2*X-10/3 = 0 // + 10/3
1/2*X = 10/3 // : 1/2
X = 10/3/1/2
X = 20/3
X = 20/3
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