$$36\div4-3\times15\div5+3\times9\div3$$
$9$
$$9-\frac{3\times 15}{5}+\frac{3\times 9}{3}$$
$$9-\frac{45}{5}+\frac{3\times 9}{3}$$
$$9-9+\frac{3\times 9}{3}$$
$$\frac{3\times 9}{3}$$
$$\frac{27}{3}$$
$$9$$
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$3^{2}$
