$$60+(72 \div 7OF3+5) \times 2$$
$\frac{144F_{3}O}{7}+70$
$$60+\frac{72}{7}OF_{3}\times 2+10$$
$$60+\frac{72\times 2}{7}OF_{3}+10$$
$$60+\frac{144}{7}OF_{3}+10$$
$$70+\frac{144}{7}OF_{3}$$
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