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X in (-oo:+oo)
X/4 = 5/10 // - 5/10
X/4-(5/10) = 0
X/4-1/2 = 0
1/4*X-1/2 = 0 // + 1/2
1/4*X = 1/2 // : 1/4
X = 1/2/1/4
X = 2
X = 2
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