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3×BD - 5×AB = 96
3(BC + CD) - 5(AC - BC) = 96
3×BC + 3×CD - 5×AC + 5×BC = 96
8×BC + 3×CD - 5×AC = 96
3×CD = 5×AC
8×BC + 3×CD - 3×CD = 96
8×BC = 96
BC = 12