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X in (-oo:+oo)
X = 1.9/2.8 // - 1.9/2.8
X-(1.9/2.8) = 0
X-0.67857143 = 0
X-0.67857143 = 0 // + 0.67857143
X = 0.67857143
X = 0.67857143
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