Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\left. \begin{array} { l } { a ^ { 2 } - 12 a - 28 + 16 b - b ^ { 2 } } \end{array} \right.$$

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