Решите плиз ,(20-(0,75+14,3-2,45)/50)/(16,5/55+12,5*4-30,3)

Решите задачу:

$(20-(0,75+14,3-2,45):50):(16,5:55+12,5\cdot4-30,3)=0,9874\\ 1.)\ 0,75+14,3-2,45=12,6\\ 2.)\ 12,6:50=\frac{126}{10}:\frac{50}{1}=\frac{126}{10}:\frac{1}{50}=\frac{63}{250}=\frac{63\cdot 4}{250\cdot 4}=\frac{252}{1000}=0,252\\ 3.)\ 20-0,252=19,748\\ 4.)\ 16,5:55=\frac{165}{10}:\frac{55}{1}=\frac{165}{10}:\frac{1}{55}=\frac{33}{10}:\frac{1}{11}=\frac{3}{10}=0,3\\ 5.)\ 12,5\cdot 4= \frac{125}{10}\cdot \frac{4}{1}=\frac{500}{10}=50\\ 6.)\ 0,3+50=50,3\\ 7.)\ 50,3-30,3=20\\$

$8.)\ 19,748:20=\frac{19748}{1000}:\frac{20}{1}=\frac{19748}{1000}:\frac{1}{20}=\frac{4937}{1000}:\frac{1}{5}=\frac{4937}{5000}=0,9874$