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X in (-oo:+oo)
X/0.4 = 6.25 // - 6.25
X/0.4-6.25 = 0
2.5*X-6.25 = 0 // + 6.25
2.5*X = 6.25 // : 2.5
X = 6.25/2.5
X = 2.5
X = 2.5
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