(10,49-s):4,02=0,805
(10,49-s)=0,805*4,02
(10,49-s)=3,2361
s=10.49-3.2361
s=7,2539
Проверка
(10,49-7,2539):4,02=3,2361:4,02=0,805
0,805=0,805