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D = (7/5)*(m-81) // - (7/5)*(m-81)
D-((7/5)*(m-81)) = 0
(-7/5)*(m-81)+D = 0
D-7/5*(m-81) = 0
D-7/5*(m-81) = 0
D-7/5*m+567/5 = 0
D-7/5*m+567/5 = 0
x belongs to the empty set
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