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w=6/gd-6/gr
-6/gd=-6/gr-w/*(-1)
6/gd=6/gr+w/*gd
6=6gd/gr+wgd/*gr
6gr=6gd+wg2dr
6gd+wg2dr=6gr
d(6g+wg2r)=6gr/:(6g+wg2r)
d=6gr/6g+wg2r