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x in (-oo:+oo)
Y = (1/6)*(X-4) // - (1/6)*(X-4)
Y-((1/6)*(X-4)) = 0
(-1/6)*(X-4)+Y = 0
Y-1/6*(X-4) = 0
Y-1/6*(X-4) = 0
Y-1/6*X+2/3 = 0
Y-1/6*X+2/3 = 0
x belongs to the empty set
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