Ebatzi: a
a=\sqrt{c^{2}-\frac{10}{f}}
a=-\sqrt{c^{2}-\frac{10}{f}}\text{, }\left(f<0\text{ or }c=0\text{ or }f\geq \frac{10}{c^{2}}\right)\text{ and }f\neq 0
Ebatzi: c
c=\sqrt{a^{2}+\frac{10}{f}}
c=-\sqrt{a^{2}+\frac{10}{f}}\text{, }\left(f>0\text{ or }a=0\text{ or }f\leq -\frac{10}{a^{2}}\right)\text{ and }f\neq 0
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