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X in (-oo:+oo)
X/18 = 4.5 // - 4.5
X/18-4.5 = 0
1/18*X-4.5 = 0 // + 4.5
1/18*X = 4.5 // : 1/18
X = 4.5/1/18
X = 80.99999352
X = 80.99999352
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