\left( \begin{array} { c c } { - 2 } & { - 1 } \\ { - 1 } & { 1 } \end{array} \right) \left( \begin{array} { l l } { a } & { b } \\ { c } & { d } \end{array} \right) \left( \begin{array} { c c } { 1 } & { 1 } \\ { 1 } & { - 2 } \end{array} \right) = \left( \begin{array} { c c } { - 3 } & { 0 } \\ { 0 } & { 6 } \end{array} \right)
Solve for a, c, b, d
a=0
c=2
b=1
d=-1
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