$$51\times33=14-(8u)$$
$u = -\frac{1669}{8} = -208\frac{5}{8} = -208.625$
$$1683=14-8u$$
$$14-8u=1683$$
$$-8u=1683-14$$
$$-8u=1669$$
$$u=\frac{1669}{-8}$$
$$u=-\frac{1669}{8}$$
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