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X in (-oo:+oo)
X/2 = 30/10 // - 30/10
X/2-(30/10) = 0
X/2-3 = 0
1/2*X-3 = 0 // + 3
1/2*X = 3 // : 1/2
X = 3/1/2
X = 6
X = 6
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