Example

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

Question

$$(7a+b)^{2}-2(7ab)(7a-b)+(7a-b)^{2}; (a-b)^{2}=a^{2}-2ab+b^{2}$$

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