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x in (-oo:+oo)
b = (4/3)*(j-4) // - (4/3)*(j-4)
b-((4/3)*(j-4)) = 0
(-4/3)*(j-4)+b = 0
b-4/3*(j-4) = 0
b-4/3*(j-4) = 0
b-4/3*j+16/3 = 0
b-4/3*j+16/3 = 0
x belongs to the empty set
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