Example

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

Question

$$n ( A ) = 10 , n ( B ) = 6 n ( A U B ) = 12 , n ( A n B ) = \cdots \cdots \cdots \cdots$$

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