y = \frac { h + 5 x } { d x + 8 }
Løs for d
\left\{\begin{matrix}d=-\frac{-5x+8y-h}{xy}\text{, }&h\neq -5x\text{ and }y\neq 0\text{ and }x\neq 0\\d\in \mathrm{R}\text{, }&h=8y\text{ and }x=0\text{ and }y\neq 0\\d\in \mathrm{R}\text{, }&x=0\text{ and }y=0\text{ and }h=0\\d\neq -\frac{8}{x}\text{, }&y=0\text{ and }h=-5x\end{matrix}\right,
Løs for h
h=dxy-5x+8y
d=0\text{ or }x\neq -\frac{8}{d}
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