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x in (-oo:+oo)
B = (8/7)*(j-43) // - (8/7)*(j-43)
B-((8/7)*(j-43)) = 0
(-8/7)*(j-43)+B = 0
B-8/7*(j-43) = 0
B-8/7*(j-43) = 0
B-8/7*j+344/7 = 0
B-8/7*j+344/7 = 0
x belongs to the empty set
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