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X in (-oo:+oo)
X/4 = 13/13 // - 13/13
X/4-(13/13) = 0
X/4-1 = 0
1/4*X-1 = 0 // + 1
1/4*X = 1 // : 1/4
X = 1/1/4
X = 4
X = 4
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