$$3/4-(-7/2)$$
$\frac{17}{4}=4.25$
$$\frac{3}{4}-\left(-\frac{7}{2}\right)$$
$$\frac{3}{4}+\frac{7}{2}$$
$$\frac{3}{4}+\frac{14}{4}$$
$$\frac{3+14}{4}$$
$$\frac{17}{4}$$
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$\frac{17}{2 ^ {2}} = 4\frac{1}{4} = 4.25$