Let $f:[-1,2] \rightarrow[0, \infty)$ be a continuous function such that $f(x)=f(1-x)$ for all $x \in[-1,2]$. Let $R_1=\int_{-1}^2 x f(x) d x$, and $R_2$ be the area of the region bounded by $y=f(x), x=-1, x=2$, and the $x$-axis. Then
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