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X in (-oo:+oo)
12 = (2*X)/3-6 // - (2*X)/3-6
6-((2*X)/3)+12 = 0
(-2/3)*X+6+12 = 0
18-2/3*X = 0 // - 18
-2/3*X = -18 // : -2/3
X = -18/(-2/3)
X = 27
X = 27
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