Solve for A, a, b
b=1
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0A-A=820
Consider the first equation. Multiply 0 and 4 to get 0.
0-A=820
Anything times zero gives zero.
-A=820
Anything plus zero gives itself.
A=-820
Divide both sides by -1.
A=-820 a=1 b=1
The system is now solved.
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