Помогите пажалуйста 1 2/3-3,6):(-2 7/9 +4 1/5)*(-2,,6)-4,1

$(1 \frac{2}{3} - 3.6) \div ( - 2 \frac{7}{9} + 4 \frac{1}{5} ) \times ( - 2.6) - 4.1 = \\ = ( \frac{5}{3} - \frac{18}{5} ) \div ( - \frac{25}{9} + \frac{21}{5} ) \times ( - \frac{13}{5} ) - \frac{41}{10} = \\ = ( \frac{25}{15} - \frac{54}{15} ) \div ( - \frac{125}{45} + \frac{189}{45} ) \times ( - \frac{13}{5} ) - \frac{41}{10} = \\ = ( - \frac{29}{15} ) \div \frac{64}{45 } \times ( - \frac{13}{5} ) - \frac{41}{10} = \\ = \frac{29 \times 45 \times 13}{15 \times 64 \times 5} - \frac{41}{10 } = \frac{29 \times 39}{320} - \frac{41}{10} = \\ = \frac{29 \times 39}{320} - \frac{41 \times 32}{320} = \frac{1131 - 1312}{320} = \frac{181}{320} \\$

ОТВЕТ: 181/320