$$\frac{9}{12}+\frac{18}{6}$$
$\frac{15}{4}=3.75$
$$\frac{3}{4}+\frac{18}{6}$$
$$\frac{3}{4}+3$$
$$\frac{3}{4}+\frac{12}{4}$$
$$\frac{3+12}{4}$$
$$\frac{15}{4}$$
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$\frac{3 \cdot 5}{2 ^ {2}} = 3\frac{3}{4} = 3.75$
