Match the equivalent expressions. \begin{array}{ll} \text{Left Column} & \text{Right Column} \\ \hline 3 \text{ groups of } 7 & 3 \text{ fours} \\ 7 + 7 + 7 + 7 & 4 \times 7 \\ 3 \times 4 & 7 + 7 + 7 \end{array}