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X in (-oo:+oo)
(1*X)/2 = 12 // - 12
(1*X)/2-12 = 0
X/2-12 = 0
1/2*X-12 = 0 // + 12
1/2*X = 12 // : 1/2
X = 12/1/2
X = 24
X = 24
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