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X in (-oo:+oo)
X/2 = 75/50 // - 75/50
X/2-(75/50) = 0
X/2-3/2 = 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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