Ответ:

Сократим дроби:

\(\frac{50}{75}=\frac{2}{3}\), \(\frac{12}{27}=\frac{4}{9}\), \(\frac{98}{105}=\frac{14}{15}\).

\(\frac{2}{3}+\frac{4}{9}-\frac{14}{15}=\frac{30}{45}+\frac{20}{45}-\frac{42}{45}=\frac{8}{45}\).

Ответ: \(\frac{8}{45}\).