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i want to number the equation without the number 2 in the image please

(Nu)(x,y)=\mu(x,y)+\frac{1}{\Gamma(r_1)\cdot\Gamma(r_2)}\displaystyle{\int_{1}^{x}}\displaystyle{\int_{1}^{y}} \left(\log\frac{x}{s} \right)^{r_1-1}\left(\log\frac{y}{s} \right)^{r_2-1}\frac{f(s,t,u(s,t))}{st}dtds 

marked as duplicate by ChrisS, Romain Picot, Andrew, user13907, Zarko Mar 25 '16 at 8:06

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