$$4 \frac { 3 } { 5 } - 2 \frac { 7 } { 10 } = \frac { 21 } { 4 }$$
$\text{false}$
$$4\left(4\times 5+3\right)-2\left(2\times 10+7\right)=105$$
$$4\left(20+3\right)-2\left(2\times 10+7\right)=105$$
$$4\times 23-2\left(2\times 10+7\right)=105$$
$$92-2\left(2\times 10+7\right)=105$$
$$92-2\left(20+7\right)=105$$
$$92-2\times 27=105$$
$$92-54=105$$
$$38=105$$
$$\text{false}$$
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