Example

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

Question

$$( x - 3 ) ^ { 2 } + ( x + 3 ) ^ { 2 } = ( x - 3 ) ( x + 3 ) + 30$$

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