$$18(-7+16)-4(91-160)+5-(-26+20)$$
$449$
$$18\times 9-4\left(91-160\right)+5-\left(-26+20\right)$$
$$162-4\left(91-160\right)+5-\left(-26+20\right)$$
$$162-4\left(-69\right)+5-\left(-26+20\right)$$
$$162-\left(-276\right)+5-\left(-26+20\right)$$
$$162+276+5-\left(-26+20\right)$$
$$438+5-\left(-26+20\right)$$
$$443-\left(-26+20\right)$$
$$443-\left(-6\right)$$
$$443+6$$
$$449$$
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