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