Срочно!!!!!!помогите!!!!

Решите задачу:

$\frac{1}{3} \times ( - 2 \frac{3}{4} ) \div (5 \frac{1}{2} ) + 2 \frac{2}{5} \div ( - 1 \frac{11}{15} ) = \frac{1}{3} \times ( - \frac{11}{4} ) \div \frac{11}{2} + \frac{12}{5} \div ( - \frac{26}{15} ) = - \frac{11 \times 2}{3 \times 4 \times 11} - \frac{12 \times 15}{5 \times 26} = - \frac{1}{6} - \frac{6 \times 3}{13} = - \frac{1}{6} - 1 \frac{5}{13} = - 1\frac{13 + 30}{78} = - 1 \frac{43}{78}$