$$200 \div 4+50-90 \div 3-20+7 \times 2$$
$64$
$$50+50-\frac{90}{3}-20+7\times 2$$
$$100-\frac{90}{3}-20+7\times 2$$
$$100-30-20+7\times 2$$
$$70-20+7\times 2$$
$$50+7\times 2$$
$$50+14$$
$$64$$
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$2^{6}$
