$$\frac { 85 } { 7 } \div 3 \frac { 5 } { 4 }$$
$\frac{20}{7}\approx 2.857142857$
$$\frac{85\times 4}{7\left(3\times 4+5\right)}$$
$$\frac{340}{7\left(3\times 4+5\right)}$$
$$\frac{340}{7\left(12+5\right)}$$
$$\frac{340}{7\times 17}$$
$$\frac{340}{119}$$
$$\frac{20}{7}$$
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$\frac{2 ^ {2} \cdot 5}{7} = 2\frac{6}{7} = 2.857142857142857$
