7. (3 points) On both sides of a road, a street lamp is installed every 10 meters from beginning to end. It is known that a total of 120 street lamps were installed. The length of this road is $\qquad$ meters.
【Solution】Solve: $[120 \div 2-1] \times 10$,
$$
\begin{array}{l}
=59 \times 10, \\
=590 \text { (meters); }
\end{array}
$$

Answer: The road is 590 meters long.
Therefore, the answer is: 590.