Solve for A
\left\{\begin{matrix}\\A=0\text{, }&\text{unconditionally}\\A\in \mathrm{R}\text{, }&D=0\text{ or }C=0\text{ or }B=0\end{matrix}\right.
Solve for B
\left\{\begin{matrix}\\B=0\text{, }&\text{unconditionally}\\B\in \mathrm{R}\text{, }&D=0\text{ or }C=0\text{ or }A=0\end{matrix}\right.
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ABCD\times 4-DCBA=0
Subtract DCBA from both sides.
3ABCD=0
Combine ABCD\times 4 and -DCBA to get 3ABCD.
3BCDA=0
The equation is in standard form.
A=0
Divide 0 by 3BCD.
ABCD\times 4-DCBA=0
Subtract DCBA from both sides.
3ABCD=0
Combine ABCD\times 4 and -DCBA to get 3ABCD.
3ACDB=0
The equation is in standard form.
B=0
Divide 0 by 3ACD.
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