$$487-(234+117):x=448=$$
$x=9$
$$x\times 487-\left(234+117\right)=448x$$
$$x\times 487-351=448x$$
$$x\times 487-351-448x=0$$
$$39x-351=0$$
$$39x=351$$
$$x=\frac{351}{39}$$
$$x=9$$
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