$$8 - [ 88 \div 20 f 11 - ( 22 - 72 \div 4 ) ]$$
$-\frac{22f_{11}}{5}+12$
$$8-\left(\frac{22}{5}f_{11}-\left(22-\frac{72}{4}\right)\right)$$
$$8-\left(\frac{22}{5}f_{11}-\left(22-18\right)\right)$$
$$8-\left(\frac{22}{5}f_{11}-4\right)$$
$$8-\frac{22}{5}f_{11}-\left(-4\right)$$
$$8-\frac{22}{5}f_{11}+4$$
$$12-\frac{22}{5}f_{11}$$
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