$$\frac{ 15 }{ 4 } - \frac{ 2 }{ 5 } + \frac{ 1 }{ 2 }$$
$\frac{77}{20}=3.85$
$$\frac{75}{20}-\frac{8}{20}+\frac{1}{2}$$
$$\frac{75-8}{20}+\frac{1}{2}$$
$$\frac{67}{20}+\frac{1}{2}$$
$$\frac{67}{20}+\frac{10}{20}$$
$$\frac{67+10}{20}$$
$$\frac{77}{20}$$
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$\frac{7 \cdot 11}{2 ^ {2} \cdot 5} = 3\frac{17}{20} = 3.85$
