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X in (-oo:+oo)
X/4 = 20/10 // - 20/10
X/4-(20/10) = 0
X/4-2 = 0
1/4*X-2 = 0 // + 2
1/4*X = 2 // : 1/4
X = 2/1/4
X = 8
X = 8
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