Leystu fyrir z, n, o, p, q, r, s, t
z\neq 0\text{, }r=5\text{, }t=5\text{, }s=5\text{, }n=5\text{, }o=5\text{, }p=5\text{, }q=5
z=0\text{, }r=t\text{, }t>0\text{, }s=t\text{, }n=t\text{, }o=t\text{, }p=t\text{, }q=t
z=-1\text{, }r=t\text{, }t\in \mathrm{R}\text{, }s=t\text{, }n=t\text{, }o=t\text{, }p=t\text{, }q=t
z=1\text{, }r=t\text{, }t\in \mathrm{R}\text{, }s=t\text{, }n=t\text{, }o=t\text{, }p=t\text{, }q=t
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