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x in (-oo:+oo)
B = (7/4)*(j-81) // - (7/4)*(j-81)
B-((7/4)*(j-81)) = 0
(-7/4)*(j-81)+B = 0
B-7/4*(j-81) = 0
B-7/4*(j-81) = 0
B-7/4*j+567/4 = 0
B-7/4*j+567/4 = 0
x belongs to the empty set
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