$$900\div\{10\{(7-4)+(9-2)\}\}$$
$9$
$$\frac{900}{10\left(3+9-2\right)}$$
$$\frac{900}{10\left(12-2\right)}$$
$$\frac{900}{10\times 10}$$
$$\frac{900}{100}$$
$$9$$
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$3^{2}$
