Solve the Exp\&Log Equations 10 Points \[ \begin{array}{l} \text { 3.1 } \log _{7}(y+8)=\log _{7}(y-1)+\log _{7}(y)(4 \mathrm{pt}) \\ 3.2 \log _{12}(1-y)+\log _{12}(-y)=1(4 \mathrm{pt}) \\