Example

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

Question

$$x^{2}+6x-27; H\cdot E\cdot F$$

Evaluate

$\left(x-3\right)\left(x+9\right)$

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