$$5x-(8x-(9x+8)$$
$6x+8$
$$5x-\left(8x-9x-8\right)$$
$$5x-\left(-x-8\right)$$
$$5x-\left(-x\right)-\left(-8\right)$$
$$5x+x-\left(-8\right)$$
$$5x+x+8$$
$$6x+8$$
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