Intask Corporation uses the first$-$in$,$ first$-$out method in its process costing system. Beginning inventory in the mixing department consisted of $6,000$ units that were $75\%$ complete with respect to conversion costs. Ending work in process inventory consisted of $5,000$ units that were $60\%$ complete with respect to conversion costs. If $12,000$ units were transferred to the next processing department during the period, the equivalent units of production for conversion cost would be: