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x in (-oo:+oo)
B = (9/4)*(j-1) // - (9/4)*(j-1)
B-((9/4)*(j-1)) = 0
(-9/4)*(j-1)+B = 0
B-9/4*(j-1) = 0
B-9/4*(j-1) = 0
B-9/4*j+9/4 = 0
B-9/4*j+9/4 = 0
x belongs to the empty set
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