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x in (-oo:+oo)
B = (5/8)*(A-12) // - (5/8)*(A-12)
B-((5/8)*(A-12)) = 0
(-5/8)*(A-12)+B = 0
B-5/8*(A-12) = 0
B-5/8*(A-12) = 0
B-5/8*A+15/2 = 0
B-5/8*A+15/2 = 0
x belongs to the empty set
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