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x in (-oo:+oo)
B = (7/8)*(a-12) // - (7/8)*(a-12)
B-((7/8)*(a-12)) = 0
(-7/8)*(a-12)+B = 0
B-7/8*(a-12) = 0
B-7/8*(a-12) = 0
B-7/8*a+21/2 = 0
B-7/8*a+21/2 = 0
x belongs to the empty set
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