Example

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

Question

$$\left. \begin{array} { l } { A = \{ 2 , 3 \} , B = \{ 1 , 2 , 3 \} C = \{ 4 , 5 \} , } \\ { A \times B } \\ { \text { l \right.$$

Solve for A, a

$a=3$

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