3. Given an arithmetic sequence $\left\{a_{n}\right\}$ with a common difference of $d, a_{1} \neq d, d \neq 0$, if the sum of the first 20 terms $S_{20}=10 M$, where $M=x a_{10}+y d$, then $x=$ $\qquad$ ,$y=$ $\qquad$
3. $x=2, y=1$