Răspuns :
x/4=3/5=>5x=12 =>x=12/5 =>verificam
12/5/4=3/5
12/5x1/4=3/5
12/20=3/5 se simplifica cu 4
3/5=3/5
12/5/4=3/5
12/5x1/4=3/5
12/20=3/5 se simplifica cu 4
3/5=3/5