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x in (-oo:+oo)
b = (1/3)*(h-1) // - (1/3)*(h-1)
b-((1/3)*(h-1)) = 0
(-1/3)*(h-1)+b = 0
b-1/3*(h-1) = 0
b-1/3*(h-1) = 0
b-1/3*h+1/3 = 0
b-1/3*h+1/3 = 0
x belongs to the empty set
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