Example

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

Question

$$( \frac { a + 2 b } { a ^ { 2 } - 2 a b } ) : \frac { b } { a b - a } , m$$

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