Example

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

Question

$${ 4 }^{ 2 } + { 5 }^{ 2 } + { \left( \right) }^{ 2 } = { 21 }^{ 2 }$$

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