$$2-4( \frac{ 2 }{ 7 } \times + \frac{ 1 }{ 7 } )$$
$\frac{90}{49}\approx 1.836734694$
$$2-\frac{4\times 2}{7}\times \frac{1}{7}$$
$$2-\frac{8}{7}\times \frac{1}{7}$$
$$2-\frac{8\times 1}{7\times 7}$$
$$2-\frac{8}{49}$$
$$\frac{98}{49}-\frac{8}{49}$$
$$\frac{98-8}{49}$$
$$\frac{90}{49}$$
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$\frac{2 \cdot 3 ^ {2} \cdot 5}{7 ^ {2}} = 1\frac{41}{49} = 1.836734693877551$
