$$2\times\frac{22}{7}\times3.5$$
$22$
$$\frac{2\times 22}{7}\times 3.5$$
$$\frac{44}{7}\times 3.5$$
$$\frac{44}{7}\times \frac{7}{2}$$
$$\frac{44\times 7}{7\times 2}$$
$$\frac{44}{2}$$
$$22$$
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$2\times 11$