$$\frac{ 9 }{ 5 } - \frac{ 4 }{ 7 } - \frac{ 8 }{ 6 }$$
$-\frac{11}{105}\approx -0.104761905$
$$\frac{63}{35}-\frac{20}{35}-\frac{8}{6}$$
$$\frac{63-20}{35}-\frac{8}{6}$$
$$\frac{43}{35}-\frac{8}{6}$$
$$\frac{43}{35}-\frac{4}{3}$$
$$\frac{129}{105}-\frac{140}{105}$$
$$\frac{129-140}{105}$$
$$-\frac{11}{105}$$
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$-\frac{11}{105} = -0.10476190476190476$