Математика даю 40 баллов! (0,014*1 2/3-0,286:(-0,6)):(-0,025)

Решите задачу:

$(0.014 \times 1 \frac{2}{3} - 0.286 \div ( - 0.6)) \div ( - 0.025) = - 20\\ 1) \: \: \: 0.014 \times 1 \frac{2}{3} = \frac{14}{1000} \times \frac{5}{3} = \frac{7 \times 5}{500 \times 3} = \frac{7}{300} \\ 2) \: \: \: 0.286 \div ( - 0.6) = - \frac{286 \times 10}{1000 \times 6} = - \frac{143}{300} \\ 3) \: \: \: \frac{7}{300} - ( - \frac{143}{300} ) = \frac{7 + 143}{300} = \frac{150}{300} = \frac{1}{2} \\ 4) \: \: \: \frac{1}{2} \div ( - 0.025) = - \frac{1 \times 1000}{2 \times 25} = - 20$