$$\frac{3}{4}+\frac{2}{5}=\frac{2}{5}+\frac{3}{4}$$
$\text{true}$
$$\frac{15}{20}+\frac{8}{20}=\frac{2}{5}+\frac{3}{4}$$
$$\frac{15+8}{20}=\frac{2}{5}+\frac{3}{4}$$
$$\frac{23}{20}=\frac{2}{5}+\frac{3}{4}$$
$$\frac{23}{20}=\frac{8}{20}+\frac{15}{20}$$
$$\frac{23}{20}=\frac{8+15}{20}$$
$$\frac{23}{20}=\frac{23}{20}$$
$$\text{true}$$
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