Example

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

Question

$$7/9 \times 21/5 \times 25( { 65 }^{ 2 } - { 55 }^{ 2 } )$$

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