What is 399 Divided by 42 using Long Division?

$$ \begin{array}{rl} & 009 \phantom{00} \leftarrow Quotient \\[-4pt] Divisor \rightarrow \phantom{0} 42 \kern-1ex & \kern-1ex \enclose{longdiv}{399} \phantom{0} \leftarrow Dividend \\[-4pt] & \phantom{} \underline{\phantom{} 0\phantom{0}} \\[-4pt] & \phantom{} 3 9 \\[-4pt] & \phantom{} \underline{\phantom{0} 0\phantom{0}} \\[-4pt] & \phantom{} 39 9 \\[-4pt] & \phantom{} \underline{\phantom{} 378\phantom{0}} \\[-4pt] & \phantom{0} 21 \phantom{0} \leftarrow Remainder \\[-4pt] \end{array} $$