Example

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

Question

$$( { 17.31 }^{ 2 } - { 12.69 }^{ 2 } )-( { 28.81 }^{ 2 } - { 0.19 }^{ 2 } )$$

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