$$13/10+21/7$$
$\frac{43}{10}=4.3$
$$\frac{13}{10}+3$$
$$\frac{13}{10}+\frac{30}{10}$$
$$\frac{13+30}{10}$$
$$\frac{43}{10}$$
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$\frac{43}{2 \cdot 5} = 4\frac{3}{10} = 4.3$
