I dont know why I cant do this, all I need to do is to get the variable d on one side and everything else on the other side:(adsbygoogle = window.adsbygoogle || []).push({});

constants: the f's and s

variables: l and d

[tex]\frac{1}{\frac{1}{\frac{1}{l}-\frac{1}{f_2}}+d}-\frac{1}{d+l-s}=\frac{1}{f_1}[/tex]

[tex]\frac{f_2-l}{df_2-dl+lf_2}-\frac{1}{d+l-s}=\frac{1}{f_1}[/tex]

[tex]\frac{d_f2+f_2l-f_2s-f_2s-dl-l^2+ls-df_2+dl-lf_2}{d^2f-d^2l+dlf_2+df_2l-dl^2+f_2l^2-sdf_2+dls-slf_2}=\frac{1}{f_1}[/tex]

when I try to solve for d, i get d^2(...)+d(....)=constants

I cant solve this because both sides will have a d in it, is there something I'm missing?

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# Get in terms of d

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