13. Move 1 matchstick to make the equation in the figure correct. Write the equation after moving on the line:
$\qquad$ (Note: The " $\mathrm{Z}$ " in the equation represents 2 )



Please write the equation after moving the matchstick on the line:
Answer: $3=11+1-2-7$
Analysis: Prioritize keeping the result unchanged, only moving one matchstick. Start from the right side of the equal sign, try to make the result of the equation 3. Therefore, we get $3=11+1-2-7$.