7. For non-zero natural numbers $a$ and $b$, the symbol $\otimes$ is defined as: $a \otimes b=\frac{m \times a+b}{2 \times a \times b}$ (where $m$ is a fixed integer). If $1 \otimes 4=2 \otimes 3$, then $3 \otimes 4$ equals $\qquad$ .
Answer: $\frac{11}{12}$