$$33+(-8)+(13+7-1)-(-4)$$
$48$
$$25+13+7-1-\left(-4\right)$$
$$38+7-1-\left(-4\right)$$
$$45-1-\left(-4\right)$$
$$44-\left(-4\right)$$
$$44+4$$
$$48$$
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$2^{4}\times 3$