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