$$3 \frac { 7 } { 12 } \times 21$$
$\frac{301}{4}=75.25$
$$\frac{36+7}{12}\times 21$$
$$\frac{43}{12}\times 21$$
$$\frac{43\times 21}{12}$$
$$\frac{903}{12}$$
$$\frac{301}{4}$$
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$\frac{7 \cdot 43}{2 ^ {2}} = 75\frac{1}{4} = 75.25$
