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