$$2.5\times4-25.5\div2.5\ of\ 2$$
$-\frac{102fo}{5}+10$
$$10-\frac{25.5}{2.5}of\times 2$$
$$10-\frac{255}{25}of\times 2$$
$$10-\frac{51}{5}of\times 2$$
$$10-\frac{51\times 2}{5}of$$
$$10-\frac{102}{5}of$$
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$\frac{2\left(25-51fo\right)}{5}$
