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x in (-oo:+oo)
B = (7/5)*(j-7) // - (7/5)*(j-7)
B-((7/5)*(j-7)) = 0
(-7/5)*(j-7)+B = 0
B-7/5*(j-7) = 0
B-7/5*(j-7) = 0
B-7/5*j+49/5 = 0
B-7/5*j+49/5 = 0
x belongs to the empty set
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