Yes, it can be reduced to 6/7.
The fraction 43/100 cannot be reduced any more!
The fraction 17/15 cannot be reduced any more.
The fraction 1/12 cannot be reduced any more.
The fraction 3/80 cannot be reduced any more.
The fraction 77/300 cannot be reduced any more.
The fraction 17/50 cannot be reduced any more.
The fraction 13/35 cannot be reduced any more.
The fraction 39/200 cannot be reduced any more.
The fraction 407/98 cannot be reduced any more.
The fraction 1/25 cannot be reduced any more.
The fraction 2083/1000 cannot be reduced any more.
The fraction 19/21 cannot be reduced any more.