Ebatzi: a, b, c (complex solution)
a=21-c-b\text{, }b=-\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\neq 0
a=21-c-b\text{, }b=\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\neq 0
Ebatzi: a, b, c
a=21-c-b\text{, }b=-\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\in \mathrm{R}
a=21-c-b\text{, }b=\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\in \mathrm{R}\text{, }c\neq 0\text{ and }\left(-cc+21c\right)^{2}-924c\geq 0
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