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B = (7/3)*(j-54) // - (7/3)*(j-54)
B-((7/3)*(j-54)) = 0
(-7/3)*(j-54)+B = 0
B-7/3*(j-54) = 0
B-7/3*(j-54) = 0
B-7/3*j+126 = 0
B-7/3*j+126 = 0
x belongs to the empty set
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