$$9F=13C+225-65$$
$C=\frac{9F-160}{13}$
$$9F=13C+160$$
$$13C+160=9F$$
$$13C=9F-160$$
$$\frac{13C}{13}=\frac{9F-160}{13}$$
$$C=\frac{9F-160}{13}$$
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$F=\frac{13C+160}{9}$
$$\frac{9F}{9}=\frac{13C+160}{9}$$
$$F=\frac{13C+160}{9}$$