$$-20 \times (13+27)=(-20 \times 13)+(-20 \times 27)$$
$\text{true}$
$$-20\times 40=-20\times 13-20\times 27$$
$$-800=-20\times 13-20\times 27$$
$$-800=-260-540$$
$$-800=-800$$
$$\text{true}$$
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