I-solve ang D, B, C, A
D=-\sqrt{7}B\text{, }B\in \mathrm{R}\text{, }C=-3\sqrt{7}\approx -7.937253933\text{, }A\in \mathrm{R}
D=\sqrt{7}B\text{, }B\in \mathrm{R}\text{, }C=3\sqrt{7}\approx 7.937253933\text{, }A\in \mathrm{R}
D=\frac{BC}{3}\text{, }B\in \mathrm{R}\text{, }C\in \mathrm{R}\text{, }A=0
D=0\text{, }B=0\text{, }C\in \mathrm{R}\setminus 3\sqrt{7},-3\sqrt{7}\text{, }A\in \mathrm{R}
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