$$4 / 13 + ( - 5 / 8 ) + ( - 8 / 13 ) + 9 / 13$$
$-\frac{25}{104}\approx -0.240384615$
$$\frac{32}{104}-\frac{65}{104}-\frac{8}{13}+\frac{9}{13}$$
$$\frac{32-65}{104}-\frac{8}{13}+\frac{9}{13}$$
$$-\frac{33}{104}-\frac{8}{13}+\frac{9}{13}$$
$$-\frac{33}{104}-\frac{64}{104}+\frac{9}{13}$$
$$\frac{-33-64}{104}+\frac{9}{13}$$
$$-\frac{97}{104}+\frac{9}{13}$$
$$-\frac{97}{104}+\frac{72}{104}$$
$$\frac{-97+72}{104}$$
$$-\frac{25}{104}$$
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$-\frac{25}{104} = -0.2403846153846154$
