Example

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

Question

$$\lim _ { x \rightarrow + \infty } ( x ^ { 3 } - x + 9 ) e ^ { - x }$$

Evaluate

$0$

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