Example

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

Question

$$( \frac { a } { 2 b } + \frac { 3 b } { 4 } ) ( \frac { a } { 2 b } - \frac { 3 b } { 4 } )$$

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