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((4*A)/3)*(2*t-20) = 160 // - 160
((4*A)/3)*(2*t-20)-160 = 0
4/3*A*(2*t-20)-160 = 0
4/3*A*(2*t-20)-160 = 0
8/3*A*t-80/3*A-160 = 0
8/3*A*t-80/3*A-160 = 0
x belongs to the empty set
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