Solve for d
d=\frac{l}{l-m}
l\neq m
Solve for l
\left\{\begin{matrix}l=\frac{dm}{d-1}\text{, }&m\neq 0\text{ and }d\neq 1\\l\neq 0\text{, }&m=0\text{ and }d=1\end{matrix}\right.
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