Question 641381
{{{S = (a-lr)/(l-r)}}}


{{{S(l-r) = a-lr}}}


{{{Sl-Sr = a-lr}}}


{{{Sl = a-lr+Sr}}}


{{{Sl+lr = a+Sr}}}


{{{l(S+r) = a+Sr}}}


{{{l = (a+Sr)/(S+r)}}}


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