Example

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

Question

$${ \left(x+4 \right) }^{ 2 } - { \left(x-5 \right) }^{ 2 } =9$$

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