$$7\frac{1}{2}+(-3\frac{3}{5})$$
$\frac{39}{10}=3.9$
$$\frac{14+1}{2}-\frac{3\times 5+3}{5}$$
$$\frac{15}{2}-\frac{3\times 5+3}{5}$$
$$\frac{15}{2}-\frac{15+3}{5}$$
$$\frac{15}{2}-\frac{18}{5}$$
$$\frac{75}{10}-\frac{36}{10}$$
$$\frac{75-36}{10}$$
$$\frac{39}{10}$$
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$\frac{3 \cdot 13}{2 \cdot 5} = 3\frac{9}{10} = 3.9$
