3/5除以6/7X等于X除以5/4
3/5÷6/7x=x÷5/4
3/5*5/4=6/7x*x
3/4=6/7x^2
x^2=3/4÷6/7
x^2=3/4*7/6
x^2=7/8
x=根号7/2根号2
x=根号14/4