$$(7^{2}+(18\div9+5^{2}))-5^{2}$$
$51$
$$49+\frac{18}{9}+5^{2}-5^{2}$$
$$49+2+5^{2}-5^{2}$$
$$51+5^{2}-5^{2}$$
$$51+25-5^{2}$$
$$76-5^{2}$$
$$76-25$$
$$51$$
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$3\times 17$
