$$=\frac{1}{(^{+}10)}-\frac{1}{(-15)}$$
$\frac{15}{151}\approx 0.099337748$
$$\frac{1}{10-\left(-\frac{1}{15}\right)}$$
$$\frac{1}{10+\frac{1}{15}}$$
$$\frac{1}{\frac{150}{15}+\frac{1}{15}}$$
$$\frac{1}{\frac{150+1}{15}}$$
$$\frac{1}{\frac{151}{15}}$$
$$1\times \frac{15}{151}$$
$$\frac{15}{151}$$
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$\frac{3 \cdot 5}{151} = 0.09933774834437085$
