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X in (-oo:+oo)
X/3-1 = 0.5 // - 0.5
X/3-1-0.5 = 0
1/3*X-1.5 = 0 // + 1.5
1/3*X = 1.5 // : 1/3
X = 1.5/1/3
X = 4.50000005
X = 4.50000005
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