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X in (-oo:+oo)
3/5 = (12/2)*X // - (12/2)*X
3/5-((12/2)*X) = 0
3/5-6*X = 0
3/5-6*X = 0 // - 3/5
-6*X = -3/5 // : -6
X = -3/5/(-6)
X = 1/10
X = 1/10
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