$$L = 7 ^ { 3 } + 9 \times 7 - 18 \div 3$$
$L=400$
$$L=343+9\times 7-\frac{18}{3}$$
$$L=343+63-\frac{18}{3}$$
$$L=406-\frac{18}{3}$$
$$L=406-6$$
$$L=400$$
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$L≔400$