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B = (4*M-C)/D // - (4*M-C)/D
B-((4*M-C)/D) = 0
(-1*(4*M-C))/D+B = 0
(-1*(4*M-C))/D+(B*D)/D = 0
B*D-1*(4*M-C) = 0
C+B*D-4*M = 0
(C+B*D-4*M)/D = 0
(C+B*D-4*M)/D = 0 // * D
C+B*D-4*M = 0
x belongs to the empty set
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