Example

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

Question

$$( x - a ) ( x + a ) = x ^ { 2 } - a ^ { 2 } ( b ^ { 2 } - 5 ^ { 2 }$$

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