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X in (-oo:+oo)
X/4 = 2/5 // - 2/5
X/4-(2/5) = 0
X/4-2/5 = 0
1/4*X-2/5 = 0 // + 2/5
1/4*X = 2/5 // : 1/4
X = 2/5/1/4
X = 8/5
X = 8/5
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