как решить уравнение - 2000:f-670=1330 и 1600:80+t=60

2000/f-670=13302000/f=1330+670f=2000|2000f=11600|80+t=60t=60-1600|80t=60-20t=40

2000:f-670=13302000:f=1330+6702000:f=2000f=2000:2000f=12000:1-670=2000-670=13301330=13301600:80+t=60t=60-1600:80t=60-20t=401600:80+40=20+40=6060=60