$$P(x)=11 \times 7-5 \times 3+4 \times 2-1$$
$69$
$$77-5\times 3+4\times 2-1$$
$$77-15+4\times 2-1$$
$$62+4\times 2-1$$
$$62+8-1$$
$$70-1$$
$$69$$
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$3\times 23$
