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X in (-oo:+oo)
X/3 = 4.5 // - 4.5
X/3-4.5 = 0
1/3*X-4.5 = 0 // + 4.5
1/3*X = 4.5 // : 1/3
X = 4.5/1/3
X = 13.50000014
X = 13.50000014
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