Example

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

Question

$$( 5 \times 5 ) ^ { 2 } - ( 5 \times 4 ) ^ { 2 } = m ^ { 2 } , m =$$

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