$$\frac{ -13 }{ 4 } - \frac{ 7 }{ 4 } + \frac{ 6 }{ 4 }$$
$-\frac{7}{2}=-3.5$
$$-\frac{13}{4}-\frac{7}{4}+\frac{6}{4}$$
$$\frac{-13-7}{4}+\frac{6}{4}$$
$$\frac{-20}{4}+\frac{6}{4}$$
$$-5+\frac{6}{4}$$
$$-5+\frac{3}{2}$$
$$-\frac{10}{2}+\frac{3}{2}$$
$$\frac{-10+3}{2}$$
$$-\frac{7}{2}$$
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$-\frac{7}{2} = -3\frac{1}{2} = -3.5$
