5 419*347 + 1 1519:725-1235

1.5 5//19=99/19
2. 3 4//7=25//7
3.(99//19)*(25//7)=(2475//133)
4. 1 15//19=34//19
5.7//25=0,28
6. (34//19)/0,28=(850//133)
7.(2475//133)+(850//133)=25 
8. 1 2//3=5//3
9. 25-(5//3)=(70//3)