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X in (-oo:+oo)
X/2+1/4 = 7/4 // - 7/4
X/2+1/4-(7/4) = 0
X/2+1/4-7/4 = 0
1/2*X-3/2 = 0 // + 3/2
1/2*X = 3/2 // : 1/2
X = 3/2/1/2
X = 3
X = 3
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