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X in (-oo:+oo)
(X/1)/3 = 12 // - 12
(X/1)/3-12 = 0
X/3-12 = 0
1/3*X-12 = 0 // + 12
1/3*X = 12 // : 1/3
X = 12/1/3
X = 36
X = 36
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