$$112-[121\div(11\times11)-(-4)-\{3-\overline{8-1}]]$$
$29$
$$112-\left(\frac{121}{121}-\left(-4\right)-\left(3-81\right)\right)$$
$$112-\left(1-\left(-4\right)-\left(3-81\right)\right)$$
$$112-\left(1+4-\left(3-81\right)\right)$$
$$112-\left(5-\left(3-81\right)\right)$$
$$112-\left(5-\left(-78\right)\right)$$
$$112-\left(5+78\right)$$
$$112-83$$
$$29$$
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