$$3 \times - { 3 }^{ 2 } - \frac{ 1 }{ 2 } \times 16$$
$-35$
$$3\left(-9\right)-\frac{1}{2}\times 16$$
$$-27-\frac{1}{2}\times 16$$
$$-27-\frac{16}{2}$$
$$-27-8$$
$$-35$$
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