$$3/2+3-7/5=$$
$\frac{31}{10}=3.1$
$$\frac{3}{2}+\frac{6}{2}-\frac{7}{5}$$
$$\frac{3+6}{2}-\frac{7}{5}$$
$$\frac{9}{2}-\frac{7}{5}$$
$$\frac{45}{10}-\frac{14}{10}$$
$$\frac{45-14}{10}$$
$$\frac{31}{10}$$
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$\frac{31}{2 \cdot 5} = 3\frac{1}{10} = 3.1$