$$\frac{ 11 }{ 18 } +(- \frac{ 5 }{ 28 } )$$
$\frac{109}{252}\approx 0.432539683$
$$\frac{154}{252}-\frac{45}{252}$$
$$\frac{154-45}{252}$$
$$\frac{109}{252}$$
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$\frac{109}{2 ^ {2} \cdot 3 ^ {2} \cdot 7} = 0.43253968253968256$
