Example

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

Question

$${ \left(8x \right) }^{ 2 } +6 \times -1+ { \left(7x \right) }^{ 2 } -9x-2$$

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