$$3\frac{1}{4}-\frac{-9}{-4}$$
$1$
$$\frac{12+1}{4}-\frac{-9}{-4}$$
$$\frac{13}{4}-\frac{-9}{-4}$$
$$\frac{13}{4}-\frac{9}{4}$$
$$\frac{13-9}{4}$$
$$\frac{4}{4}$$
$$1$$
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